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Mermaid Costumes

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When you’re looking for a captivating costume, you can’t go wrong with a mermaid costume! Your child will look great in one of our girl’s mermaid costumes while you stun in any of our mermaid costumes for adults! There’s something for everyone in our selection of mermaid Halloween costumes, from mermaid tail skirts to wigs and golden accessories, you’ll find everything you need for an excellent Halloween!
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1 - 60 of 215
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Girl's Little Mermaid Ariel Costume-2
Made By Us Exclusive
Kids Disney Ariel Costume Outfit
Sale - 20% Made By Us
Girls Sparkling Mermaid Costume
Sale - 20% Made By Us
$70.99$56.99-$70.99*
Women's Sea Siren
Made By Us Exclusive
Plus Size King Triton Costume-2
Sale - 13% Made By Us
Little Mermaid Live Action Child Ariel Costume
Sale - 50%
Deluxe Under the Sea Beauty
Sale - 46% Made By Us
Adult Disney Ariel Costume Outfit
Made By Us Exclusive
Adult King Triton Costume
Sale - 21% Made By Us
The Little Mermaid Adult Premium Ariel Mermaid Dress
Sale - 10% Made By Us
Plus Size Disney Mermaid Ariel Costume
Sale - 36% Made By Us
Women's Deep Sea Mermaid Costume
Sale - 50% Made By Us
Infant Mermaid Costume Bunting
Sale - 14% Made By Us
Women's Shell-a-brate Mermaid Costume
Sale - 58% Made By Us
Men's Salty Merman Costume
Made By Us Exclusive
Girl's Skeleton Mermaid Costume
Sale - 29%
$49.99$35.99-$49.99*
Plus Size Women's Undersea Mermaid Costume
Sale - 38% Made By Us
Girl's Darkest Siren Costume
Sale - 50%
Little Mermaid Girls Ariel Classic Costume
Sale - 33%
Pretty Purple Mermaid Child's Costume
Sale - 13% Made By Us
Sweet Mermaid Child Costume
Sale - 44%
$63.99$35.99-$49.99
Girl's Sea Siren Costume Main
Clearance Made By Us
Under the Sea Mermaid Women's Costume
Sale - 27%
Little Mermaid Child Prestige Ariel Sound and Light Costume
Clearance  - 70%
Girls Mermaid Costume
Sale - 40%
$35.99$21.99-$35.99
Men's Mermaid Mafia Costume
Clearance  - 60%
Plus Size Women's Shell-a-brate Mermaid Costume
Clearance Made By Us
Women's Under the Sea Mermaid
Clearance  - 69%
Girl's Dark Skeleton Mermaid Costume
Sale - 42%
Womens Spooky Siren Costume
Sale - 64% Made By Us
$70.99$25.99-$70.99*
Kid's Playful Mermaid Costume
Made By Us Exclusive
Men's Poseidon Costume
Made By Us Exclusive
Sea Siren Women's Costume
Made By Us Exclusive
$91.99
Adult Mermaid Costume
Sale - 31% Made By Us
Adult Sweet Mermaid Costume
Sale - 33%
Women's Venus Mermaid
Sale - 44%
$126.99$70.99-$126.99*
Womens Deep Sea Siren Costume
Sale - 22%
$126.99$98.99-$112.99
Plus Size Salty Merman Costume
Made By Us Exclusive
Poseidon Plus Size Men's Costume
Made By Us Exclusive
Kids Bubbly Mermaid Costume
Sale - 38% Made By Us
$56.99$35.99-$56.99*
Kids Poseidon Costume
Made By Us Exclusive
Mens Sexy Poseidon Costume
Made By Us Exclusive
Blue Seas Mermaid Deluxe Girls Costume
Sale - 22%
King Triton Staff
Sale - 33% Made By Us
Deluxe Fuchsia Gogo Boots Single UPD
Sale - 50% Made By Us
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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! 

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