Mermaid Costumes

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We contend that Mermaids aren't real no matter how many of those weird documentaries on the History Channel say they are! We need ireffutable proof... but wait a minute... there's been a new sighting and it's pretty compelling... this can't be, but mermaids ARE real and they've been sitting right here at Halloweencostumes.com this entire time! This is remarkable! We're looking through our spyglass here and we see mermaid costumes for kids and women both, from sexy to classic styles, and even mermaid costumes that recreate a certain animated character that loves to sing on rocks! Someone call a documentary crew because we've got the scoop of the century here!

Whether you want a sexy mermaid costume, a stunning girls mermaid outfit, a goth mermaid costume, or even an under the sea warrior - we have it all!

We'll help you find the right size!

We've hand-measured every costume to help you find the size that fits best.

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Mermaid Costumes

Adult Mermaid Costume

Child Mermaid Princess Costume

Sea Siren Women's Costume

Toddler Mermaid Costume

Little Mermaid Ariel Deluxe Women's Costume

Men's Poseidon Costume

Under the Sea Mermaid Women's Costume

Women's Sea Siren Plus Size Costume

Poseidon Plus Size Men's Costume

Women's Fantasy Mermaid Costume

Women's Hipster Mermaid Costume

Adult Pirate and Mermaid Costume

Child Mermaid Costume

Women's Deep Sea Siren Costume

Womens Pink Mermaid Costume

Teal Mermaid Long Tail Skirt Costume

Adult Women's Mythic Mermaid Costume

Women's Skeleton Siren Costume

Women's Deluxe Mermaid Costume

Rebel Mermaid Women's Costume

Women's Blue Mermaid Fin Skirt Costume

Aqua Warrior Women's Costume

Adult Sweet Mermaid Costume

Girl's Barbie Mermaid Costume

Women's Pink Mermaid Fin Skirt Costume

King Neptune Costume

Men's Mermaid Mafia Costume

Women's Sexy Noir Mermaid Costume

Seashell Mermaid Costume

Womens Siren of the Sea Costume

Elite Mermaid Costume

High-Waisted Mermaid Costume

Women's Black Mermaid Costume

Deluxe Womens Ariel Costume

Girls Mermaid Costume

Women's 2 Pc Sultry Sea Siren Costume

Women's Disney Deluxe Ariel Costume

Women's Silver Mermaid Heels

Lil Mermaid Wig

Seaweed Boa

Sea Shell Purse

Women's Pastel Rainbow Wavy Wig

Wavy Grey/Purple Women's Ombre Wig

Women's Tipsy Elves Mermaid Santa Ugly Sweater

Women's Green Mermaid Heels

Women's Green Mermaid Shoes

Green Mermaid Leggings

Magical Mermaid Wig

Women's Silver Mermaid Shoes

Adult Mermaid Leggings

Purple Mermaid Shell Bra Top

Women's Mermaid Deluxe Leggings

Teal Mermaid Shell Bra Top

Women's Blue Mermaid Leggings

Pink Ombré Wig

Deluxe Women's Mermaid Tail Skirt

Fun World Mermaid Face Jewelry Kit

Supernova Wig

Styleable Fever Khloe Neon Red Wig

Mermaid Pearl Starfish Headband