Vibrant Underwater Costumes for Halloween

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Main Content
Undersea Mermaid Costume for Women

Undersea Mermaid Costume for Women

$79.99$49.99
Women's Deluxe Under the Sea Beauty Costume

Women's Deluxe Under the Sea Beauty Costume

$79.99$49.99
Deep Sea Mermaid Women's Costume

Deep Sea Mermaid Women's Costume

$69.99$49.99 - $69.99
Plus Size Under the Sea Mermaid Women's Costume

Plus Size Under the Sea Mermaid Women's Costume

$114.99
Playful Mermaid Kid's Costume

Playful Mermaid Kid's Costume

$49.99$39.99 - $49.99
Plus Size Under the Sea Women's Mermaid Costume

Plus Size Under the Sea Women's Mermaid Costume

$79.99$59.99 - $79.99
Sea Siren Girl's Costume

Sea Siren Girl's Costume

$59.99$39.99
Women's Under the Sea Mermaid Costume | Mermaid Adult Costume

Women's Under the Sea Mermaid Costume | Mermaid Adult Costume

$99.99$49.99 - $99.99
Mermaid Girls Costume

Mermaid Girls Costume

$24.99$19.99
Blue Adult Octopus Costume

Blue Adult Octopus Costume

$69.99
Hipster Mermaid Women's Costume | Mermaid Halloween Costumes

Hipster Mermaid Women's Costume | Mermaid Halloween Costumes

$39.99$29.99
Majestic Jellyfish Women's Costume | Sea Creature Costumes

Majestic Jellyfish Women's Costume | Sea Creature Costumes

$89.99
Venus Mermaid Women's Costume

Venus Mermaid Women's Costume

$114.99$59.99 - $99.99
Women's Plus Size Orange Iridescent Octopus Costume | Sea Creature Costumes

Women's Plus Size Orange Iridescent Octopus Costume | Sea Creature Costumes

$99.99$79.99
Shell-a-brate Women's Mermaid Costume

Shell-a-brate Women's Mermaid Costume

$59.99$19.99 - $24.99
Child Mysterious Mermaid Costume | Sea Creature Costumes

Child Mysterious Mermaid Costume | Sea Creature Costumes

$39.99
Kids Pretty Purple Mermaid Costume

Kids Pretty Purple Mermaid Costume

$39.99 - $59.99
Blue Octopus Kid's Costume | Sea Creature Costumes

Blue Octopus Kid's Costume | Sea Creature Costumes

$59.99$49.99
Orange Iridescent Octopus Women's Costume | Animal Costumes

Orange Iridescent Octopus Women's Costume | Animal Costumes

$89.99$69.99
Women's Little Mermaid Live Action Ariel Costume

Women's Little Mermaid Live Action Ariel Costume

$59.99$29.99 - $39.99
Girl's Toddler Mermaid Costume

Girl's Toddler Mermaid Costume

$29.99
Sequined Seahorse Costume for Women

Sequined Seahorse Costume for Women

$49.99$34.99
Ocean Octopus Kid's Costume | Kid's Sea Creature Costumes

Ocean Octopus Kid's Costume | Kid's Sea Creature Costumes

$39.99
Adult The Little Mermaid Deluxe Ariel Costume

Adult The Little Mermaid Deluxe Ariel Costume

$59.99$44.99
Women's Plus Size Alluring Sea Siren Mermaid Costume | Sexy Mermaid Costume

Women's Plus Size Alluring Sea Siren Mermaid Costume | Sexy Mermaid Costume

$99.99$79.99
Adorable Anglerfish Costume for Kids | Kid's Fish Costumes

Adorable Anglerfish Costume for Kids | Kid's Fish Costumes

$39.99
Child Purple Octopus Costume | Kid's Sea Creature Costumes

Child Purple Octopus Costume | Kid's Sea Creature Costumes

$69.99
Ocean Octopus Infant Costume | Infant Sea Creatures Costumes

Ocean Octopus Infant Costume | Infant Sea Creatures Costumes

$39.99$29.99 - $39.99
Little Mermaid Live Action Child Ariel Costume

Little Mermaid Live Action Child Ariel Costume

$39.99$14.99 - $39.99
Little Mermaid Ariel Classic Costume

Little Mermaid Ariel Classic Costume

$29.99$19.99
Adult Little Mermaid Live Action Deluxe Ariel Costume

Adult Little Mermaid Live Action Deluxe Ariel Costume

$99.99$74.99 - $99.99
Toddler Dolphin Costume

Toddler Dolphin Costume

$39.99$34.99
Sea Siren Costume for Women | Mermaid Costumes

Sea Siren Costume for Women | Mermaid Costumes

$89.99$69.99
The Little Mermaid Girl's Prestige Ariel Sound and Light Up Costume

The Little Mermaid Girl's Prestige Ariel Sound and Light Up Costume

$129.99$49.99
Toddler Purple Octopus Costume | Made by Us Sea Creature Costumes

Toddler Purple Octopus Costume | Made by Us Sea Creature Costumes

$59.99
Exclusive Disney Flounder Halloween Costume for Adults

Exclusive Disney Flounder Halloween Costume for Adults

$79.99$69.99
Kid's Orange Starfish Costume | Sea Creature Costumes

Kid's Orange Starfish Costume | Sea Creature Costumes

$59.99$49.99
Fish Tunic Toddler Costume | Toddler Animal Costumes

Fish Tunic Toddler Costume | Toddler Animal Costumes

$59.99$49.99
Disney Little Mermaid Ariel Deluxe Costume for Women

Disney Little Mermaid Ariel Deluxe Costume for Women

$79.99 - $109.99
Sparkling Mermaid Costume | Exclusive | Made By Us

Sparkling Mermaid Costume | Exclusive | Made By Us

$59.99$49.99 - $59.99
The Little Mermaid Baby Posh Ariel Costume

The Little Mermaid Baby Posh Ariel Costume

$49.99$24.99
Adult Swordfish Costume | Animal Costumes for Adults

Adult Swordfish Costume | Animal Costumes for Adults

$109.99
Salty Merman Men's Costume | Mermaid Costumes

Salty Merman Men's Costume | Mermaid Costumes

$69.99 - $79.99
Disney Little Mermaid Girl's Sustainable Ariel Costume Dress | Disney Costumes

Disney Little Mermaid Girl's Sustainable Ariel Costume Dress | Disney Costumes

$29.99$24.99 - $29.99
Child Disney The Little Mermaid King Triton Costume | Disney Costumes

Child Disney The Little Mermaid King Triton Costume | Disney Costumes

$89.99
Pink Seahorse Costume for Girls | Kid's Animal Costumes

Pink Seahorse Costume for Girls | Kid's Animal Costumes

$39.99 - $69.99
Little Mermaid Child Deluxe Ariel Costume Dress | Disney Princess Costumes

Little Mermaid Child Deluxe Ariel Costume Dress | Disney Princess Costumes

$54.99$34.99 - $49.99
Plus Size Disney Little Mermaid Flounder Costume | Disney Costumes

Plus Size Disney Little Mermaid Flounder Costume | Disney Costumes

$79.99$69.99

About Vibrant Underwater Costumes for Halloween

Dive into a world of enchantment with our vibrant underwater costumes for Halloween at HalloweenCostumes.com. Perfect for those who dream of shimmering seas and magical marine life, this collection features a variety of stunning designs that capture the essence of the ocean. From elegant mermaids to playful sea creatures, each costume is crafted with vibrant colors and intricate details, ensuring you stand out at any Halloween event. Whether you're looking for a whimsical look for a child or a glamorous ensemble for adults, our selection offers something for everyone. With flowing fabrics, eye-catching embellishments, and comfortable fits, these costumes allow you to embrace your underwater fantasy while enjoying the festivities.

Our vibrant underwater costumes are designed to inspire creativity and imagination, making them ideal for Halloween parties, themed events, or dress-up fun. Each piece is thoughtfully made to provide a flattering fit for all body types, including plus sizes, ensuring that everyone can join in on the aquatic adventure. With options that range from classic mermaid styles to unique sea sirens, you can express your personality while celebrating the magic of the ocean. Complete your look with accessories like shimmering wigs, seashell jewelry, and makeup that reflects the beauty of the sea. At HalloweenCostumes.com, we believe that every costume should make a splash, so explore our vibrant underwater collection and make this Halloween unforgettable.

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