Under the Sea

Dive into a celebration under the waves. Our under the sea party decorations and supplies bring ocean color to the table with shell plates, fish and mermaid napkins, shark balloons, and everything in between. Perfect for a splashy birthday, a pool party, or a little explorer's ocean adventure.

59 products
White small plate with a pink lobster center and a blue checkerboard border, front view for a seafood boil
Outdoor coastal table with lobster plates on woven chargers, white flowers, and blue checked accents
Le Lobster Small Plates
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$8.50
Lobster guest towel with a red lobster print over a blue and white checker border for a seafood boil party
Stack of lobster print paper guest towels with blue checkerboard trim for a nautical summer party
Le Lobster Guest Towels
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$8.50
Red lobster print large napkin with wavy blue stripes for a summer seafood boil, nautical, or coastal party
Side view of stacked lobster print paper napkins with red crustaceans and a wavy blue stripe pattern
Le Lobster Large Napkins
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$7.50
Meri Meri octopus plates on white background with colorful illustrated octopus design for ocean birthday parties
Octopus plates at an under-the-sea birthday party table with coordinating napkins and cups
Octopus Plates
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$9.50
Meri Meri octopus napkins on white background with colorful illustrated octopus print for ocean birthday parties
Octopus napkins styled at an under-the-sea party table with turtle plates and ocean decor
Octopus Napkins
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$8.50
Meri Meri turtle plates on white background with colorful illustrated sea turtle design for ocean birthday parties
Turtle plates styled at an under-the-sea birthday party table with ocean-themed tableware
Turtle Plates
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$10.50
Meri Meri turtle napkins on white background with colorful illustrated sea turtle print for ocean parties
Turtle napkins at an under-the-sea birthday party table with ocean-themed decor and tableware
Turtle Napkins
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$8.50
Meri Meri shark cups on white background with illustrated shark and ocean design for beach birthday parties
Shark cups flat lay from above showing the Meri Meri shark and ocean print design for under-the-sea parties
Shark Cups
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$10.50
Meri Meri seahorse napkins on white background with colorful seahorse and ocean print for a mermaid party
Under the sea flat lay with an aqua seahorse napkin, scalloped mermaid plate, and seashell favor bag on pink
Seahorse Napkins
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$8.50
Mint paper cup with a foil scale pattern in blue, aqua, and black for a mermaid or under the sea party
Mermaid scale cups beside a blue drink dispenser on a wood console with shell banner decor for an ocean party
Mermaid Tail Party Cups
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$9.00
Needoh Jellysquish in its colorful box with a clear window showing a blue jellyfish squishy toy
Hand squeezing a blue glittery jellyfish shaped Needoh with dangling tentacles on white
Jellysquish Needoh
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$19.99
White small plate with a navy and red sailboat, rope ring, and navy striped rim with gold edge, top view
Boat shaped plates at a patriotic party table with red, white, and blue decor
Set Sail Small Plates
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$7.95
Set Sail beach club cocktail napkins with a life ring, anchor, lobster, sailboat, and beach club script for a nautical party
Nautical party picnic table with sailboat napkins, a red and white stripe runner, and sailboat cupcakes for summer
Set Sail Beach Club Cocktail Napkins
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$5.95
Set Sail guest towels in light blue stripe with tiny sailboats and rope for a nautical summer party
Nautical party picnic table with sailboat napkins, a red and white stripe runner, and sailboat cupcakes for summer
Set Sail Guest Towels
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$7.95
Sky blue scalloped dinner plate shown from above on a white background
Western place setting with a silver cowboy hat plate on a sky blue scalloped plate and a cowboy boot napkin
Sky Blue Compostable Dinner Plates
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$13.95
Sky blue napkin with a scalloped edge shown flat on a white background
Sky blue, French Crème, and petal pink scalloped plates with matching scalloped napkins in a pastel flat lay
Sky Blue Eco Large Napkins
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$7.95
Palisades blue cabana stripe plates for a summer or beach party
Lemon party table with blue striped plates under lemon print plates, red cups, and a pink striped runner
Palisades Blue Signature Cabana Stripe Plates
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$8.95
Blue and white cabana stripe paper guest towel for a summer, nautical, or beach party table
Blue and orange birthday party table with cabana stripe guest towels, orange plates, and foam dart favors
Palisades Blue Signature Cabana Stripe Guest Towels
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$7.95
Blue and white cabana stripe paper cup with a gold foil rim on a white background, for a summer party
Fourth of July cookout table with a burger cake, blue striped cups, red gingham, and blue balloons
Palisades Blue Signature Cabana Stripe Cups
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$6.95
Palisades blue and white cabana stripe paper table runner partly unrolled on a white background, for a beach party
Blue scalloped baby shower plate with pastel roses and blue floral napkins on a bold blue striped runner
Palisades Blue Signature Cabana Stripe Table Runner
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$16.95
Light blue and royal blue cabana stripe decagon large plate with gold rim, front view for a nautical party
Angled side view of the blue cabana stripe plate showing its gold edge
Light & Dark Blue Signature Cabana Stripe Large Plates
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$8.95
Light and dark blue cabana stripe guest towels for a summer or nautical party
Light and dark blue cabana stripe guest towels stacked at an angle showing the layered striped edges
Light & Dark Blue Signature Cabana Stripe Guest Towels
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$7.95
Palisades blue large paper party plate in a solid royal blue decagon shape for a summer or nautical party
Angled stack of solid royal blue decagon large plates for a beach, pool, or color block party table
Palisades Blue Signature Large Plates
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$8.95
Midnight blue decagon large party plate with a gold rim on a white background
Navy and white striped plates with midnight blue plates, cups, and Happy Birthday napkins in a flat lay
Midnight Blue Signature Large Plates
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$8.95
Midnight blue signature party cups for a holiday, graduation, or elegant celebration
Midnight blue party cups with gold rims styled with navy Happy Birthday plates, napkins, and confetti
Midnight Blue Signature Cups
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$6.95
Meri Meri mermaid scalloped fringe cups on white background, holographic fringe cups for mermaid parties
Mermaid party flat lay with a stack of striped fringe cups beside a seashell bag, mermaid plate, and napkins
Mermaid Scalloped Fringe Cups
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$12.00
Meri Meri watercolor clam shell plates on white background, die-cut clam shell shape with soft watercolor print
Watercolor Clam Shell Plates
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$11.50
Meri Meri watercolor clam shell napkins on white background, clam shell shape with soft watercolor ocean print
Watercolor clam shell napkins by Meri Meri flat lay showing the soft blue and pink watercolor design
Watercolor Clam Shell Napkins
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$8.50
Bow and seashell cocktail napkins for a coastal or summer party
Bow Sea Shell Cocktail Napkins
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$6.95
Apres sea cocktail napkins for a coastal or summer party
Apres Sea Cocktail Napkins
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$6.50
Meri Meri Mermaid Favor Bags on white background, iridescent holographic bags with mermaid tail design
Mermaid party flat lay with an ivory seashell favor bag with pink handles, plates, napkins, and cups
Mermaid Favor Bags
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$20.00
Blue snow cone confetti in a 1 ounce tube with aqua tissue dots and silver flakes for a summer pool or winter party
Blue snow cone confetti tube styled with a snow cone cookie and disco balls for a summer party
Blue Snow Cone Artisan Confetti
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$14.00
Sky blue and gold cutlery for an elegant party or wedding
Petite playground carousel horse plates layered on blue striped plates with a red stripe runner and apples
Fancy Sky Blue and Gold Cutlery
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$25.00
Dark royal blue plastic forks fanned out side by side on a white background, for a party table
Dark Blue Plastic Forks
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$6.50
Close-up of a robin's egg blue paper linen tablecloth draped over a table corner for a baby shower or Easter brunch
Robin's egg blue paper linen banquet table cover for a baby shower, spring, or birthday party
Robin's Egg Blue Paper Linen Tablecloth
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$16.50
Midnight blue melamine pedestal cake stand on a white background, ready for a party dessert table
Navy cake stand holding a striped party hat cake at a red, white, and blue Fourth of July dessert table
Large Midnight Blue Pedestal Melamine Cake Stand
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$37.95
Red, white, and blue dessert table with navy box risers, a star studded cake, and paper fan decorations
Red striped and navy box risers stacked beside a flag and flower arrangement under a striped July 4th table
Midnight Blue Display Box Risers
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$5.95
Lavender shark shower buffer sponge beside its gray shark face box with an award badge, ocean party favor
Purple shark bath sponge and gray box on sand with coral, a shark birthday bath time scene
Sammy Shark Shower Buffer Sponge
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$15.00
Blue whale shower buffer sponge beside its smiling whale face box, an under the sea party favor
Blue whale bath sponge and box on sand with coral and a tropical fish, ocean birthday bath time scene
Walter Whale Shower Buffer Sponge
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$15.00
Pale yellow honeycomb jellyfish decorations with iridescent paper streamer tentacles for an under the sea party
Honeycomb jellyfish hanging inside a gold arch with pastel and pearly balloons for a mermaid party backdrop
Honeycomb Jellyfish Set
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$15.00
Meri Meri Under the Sea garland on white background with fish, octopus, and sea creature pennants
Under the Sea Garland
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$38.00
Pastel seashell banner with lavender shells, pink starfish, and mint seaweed shapes for a mermaid party
Close-up of the seashell banner hung above a pastel dessert table with cake stands for an under the sea party
Seashell Jumbo Banner
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$11.50
Meri Meri Mermaid Fringe Garland on white background, holographic iridescent fringe with mermaid tail shapes
Mermaid fringe garland displayed at a mermaid-themed kids birthday party table with coordinating tableware
Mermaid Fringe Garland
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$28.00
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Two curved swags of aqua blue foil fringe banner on a white background, for a baby shower or pool party
Aqua blue fringe banner on a pink backdrop with sample white lettering reading Your Sign Here
Blue Fringe Foil Banner
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$20.00 $14.00
Sale
Two strands of shimmery light blue scalloped fringe banner on white, for a coastal or bachelorette backdrop
Light blue scalloped tinsel fringe banner on pink with a starburst callout about its layered fringe
Blue Scallop Fringe Banner
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$28.00 $22.00
Royal blue tissue macrame fringe garland for a birthday party or celebration backdrop
Dark Blue Streamer Garland
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$8.95
Pastel paper fan set in mint, lavender, blush, and cream with seashell and starfish shapes for a mermaid party
Pastel paper fans and pearly balloons styled around a gold arch backdrop for an under the sea party
Under the Sea Fan Set
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$25.00
White scallop seashell foil balloon with gold foil ridges, shown on white for a mermaid or beach party
White Seashell Foil Balloon
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$7.50
Blue shark foil balloon with a white belly and a friendly smiling face for an under the sea party
Side view of the blue shark foil balloon with dorsal fin and smiling face for ocean party themes
Shark Foil Balloon
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$8.50
Mint green seahorse foil balloon with pink fins on a white background for a mermaid party
Seahorse balloons styled with a pink shell backdrop and pastel streamers at an under the sea party
Seahorse Foil Balloon
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$12.00
Seashell Lip Balm Trio box with purple, blue, and silver shell shaped vanilla lip balms in Shimmering Seashell packaging
Three open seashell lip balms in purple, blue, and silver, each with a heart shaped lid and vanilla balm inside
Seashell Lip Balm Trio
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$17.00
Slate blue plush shark with a cream belly and stitched toothy grin, facing right on white, for an ocean party
Plush shark facing left, showing its soft blue gray fur, fins, and cream underside
Seaborn Shark Stuffed Animal by Mon Ami
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$33.00
Front of the peach and ivory scallop shell glass ornament with glittered ridges, on white
Scallop shell ornament hanging on a lit Christmas tree with soft bokeh lights
Scallop Shell Christmas Ornament
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$16.99
Front of the nautilus shell glass ornament showing its pearly ivory inner spiral, on white
Nautilus shell ornament hanging on a lit Christmas tree with soft bokeh lights
Nautilus Shell Christmas Ornament
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$16.99
Front of the Mexican shell glass ornament with pink glitter opening and pearly white ridges, on white
Pink Mexican shell ornament hanging on a lit Christmas tree with warm bokeh lights
Mexican Shell Christmas Ornament
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$21.99
Front of the junonia shell glass ornament showing its peach opening and brown spots, on white
Junonia shell ornament hanging on a lit Christmas tree with warm bokeh lights
Junonia Shell Christmas Ornament
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$19.99
Front of the pearly white wentletrap shell glass ornament with gold-lined opening, on white
White wentletrap shell ornament hanging on a lit Christmas tree with soft bokeh lights
Wentletrap Shell Christmas Ornament
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$16.99
Front of the amber gold glitter seashell glass ornament with a pearly spiral tip, on white
Golden seashell ornament hanging on a lit Christmas tree with warm bokeh lights
Golden Seashell Christmas Ornament
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$16.99
Front of the seashell mermaid glass ornament with golden hair, pink flower, and green tail, on white
Seashell mermaid ornament hanging on a lit Christmas tree with soft bokeh lights
Seashell Mermaid Christmas Ornament
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$21.99

An under the sea party is all about ocean color and a little sense of wonder. This collection pulls the whole reef together with ocean and shell tableware, fish and crab napkins, shark and mermaid balloons, and banners to set a watery scene. It works for a first birthday, a pool party, or any celebration that loves the deep blue.

Mix bright corals and aquas or keep it soft and sandy, then add favors and a coordinating banner to finish. For a more specific direction, pair it with our Mermaid party supplies for shimmer, and build a table that feels like a day at the shore.

FAQs

Start with ocean tableware: plates, napkins, and cups in shells, fish, and waves. Add shark or mermaid balloons, a banner, and a cake topper, then favors to send little explorers home. Mixing a few sea creatures keeps the theme broad and playful.

Popular under the sea themes include mermaids, sharks, ocean animals, and classic shells and waves. Many families pick one favorite, like a mermaid or a shark, and use the rest as accents for a full reef of color.

Anchor the table with ocean-print plates and napkins in blues, greens, and corals. Float shark, fish, or mermaid balloons above a banner, and add a few shells or sea creatures down the center. Streamers in wave colors make an easy backdrop for photos.

Explore More Celebrations

Mermaid party supplies for a mermaid theme birthday party.
Mermaid
Red, white, and blue nautical tablescape on the sand with sailboat plates and croissant boats for a summer boating party
Nautical | Coastal
Boat paper plate on a scene with blue and red party supplies
Sailing & Nautical Party Supplies & Decorations
Pool party table with blue cabana stripe plates, tropical napkins, and a beach ball balloon for a summer birthday or luau.
Pool & Beach Party Supplies