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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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Girls Sparkling Mermaid Costume
Sale - 20% Made By Us
$71.99$57.99-$71.99*
Girl's Little Mermaid Ariel Costume-2
Made By Us Exclusive
Kids Disney Ariel Costume Outfit
Sale - 20% Made By Us
Women's Sea Siren
Made By Us Exclusive
Adult King Triton Costume
Sale - 21% Made By Us
Plus Size King Triton Costume-2
Sale - 13% Made By Us
Deluxe Under the Sea Beauty
Sale - 46% Made By Us
Little Mermaid Live Action Child Ariel Costume
Sale - 50%
Girl's Skeleton Mermaid Costume
Sale - 29%
$50.99$35.99-$50.99*
Women's Deep Sea Mermaid Costume
Sale - 50% 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
Infant Mermaid Costume Bunting
Sale - 14% Made By Us
Women's Shell-a-brate Mermaid Costume
Sale - 58% Made By Us
Plus Size Women's Undersea Mermaid Costume
Sale - 15% Made By Us
Little Mermaid Girls Ariel Classic Costume
Sale - 33%
Men's Salty Merman Costume
Made By Us Exclusive
Adult Disney Ariel Costume Outfit
Made By Us Exclusive
Sweet Mermaid Child Costume
Sale - 44%
$64.99$35.99-$64.99
Pretty Purple Mermaid Child's Costume
Sale - 13% Made By Us
Under the Sea Mermaid Women's Costume
Sale - 27%
Men's Mermaid Mafia Costume
Clearance  - 60%
Girls Mermaid Costume
Sale - 40%
$35.99$21.99-$35.99
Girl's Dark Skeleton Mermaid Costume
Sale - 42%
Women's Under the Sea Mermaid
Sale - 69%
Little Mermaid Child Prestige Ariel Sound and Light Costume
Clearance  - 70%
Womens Spooky Siren Costume
Sale - 64% Made By Us
$71.99$25.99-$71.99*
Girl's Sea Siren Costume Main
Clearance Made By Us
Kid's Playful Mermaid Costume
Made By Us Exclusive
Plus Size Women's Shell-a-brate Mermaid Costume
Clearance Made By Us
Girl's Darkest Siren Costume
Sale - 50%
Men's Poseidon Costume
Made By Us Exclusive
Poseidon Plus Size Men's Costume
Made By Us Exclusive
Adult Mermaid Costume
Made By Us Exclusive
Adult Sweet Mermaid Costume
Sale - 33%
Women's Venus Mermaid
Sale - 44%
$129.99$71.99-$129.99*
Plus Size Salty Merman Costume
Made By Us Exclusive
Kids Bubbly Mermaid Costume
Sale - 38% Made By Us
$57.99$35.99-$57.99*
Womens Deep Sea Siren Costume
Sale - 22%
$129.99$100.99-$129.99
Mens Sexy Poseidon Costume
Made By Us Exclusive
Blue Seas Mermaid Deluxe Girls Costume
Sale - 22%
Kids Poseidon Costume
Made By Us Exclusive
Sea Siren Women's Costume
Made By Us Exclusive
$93.99
King Triton Staff
Sale - 33% Made By Us
Mermaid Shell Headband
Sale - 80% 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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