Halloween is quickly approaching so here are eight ocean and scuba-themed costume ideas for you and your ocean-loving family.

1. Scuba Divers

Billy and Isaiah dream of one day becoming certified scuba divers just like their parents and were thrilled when they got to dress up as divers while attending a trick-or-trunk event. This costume is great for any age and can be super simple or more intricate for anyone who loves to craft.

For more information on how to create your own scuba diver costume, click here.


2. Neon Jellyfish

This jellyfish costume is sure to receive glowing reviews! While this vibrant costume might look like a challenge to build, it doesn’t require any sewing and can be easily customized to your liking. When buying lights to include in the hat, buy LED lights because they won’t get hot.


If you are interested in recreating this jellyfish costume, click here.


3. Shark Cage Diver

Want a jaw-dropping costume on wheels? This shark cage diving costume is one of a kind and perfect for any shark enthusiast. While this costume does require a bit more time and dedication to create, we think the end result is Fin-tastic! 


Click here to see what materials are recommended to create this masterpiece.


4. Mermaid and Friends

If you have a little mermaid in your family, this group costume is a beloved classic. Whether you choose to purchase new costumes or create your own, there is a character for everyone in the family, even your pets! 


5. Baby Shark

This no-sew costume is perfect for any little one who needs to be kept warm while enjoying some of their earliest Halloween memories. All you need to create this baby shark is a grey onesie, some colored felt (light pink, white, and black), scissors, and fabric glue.


For more info about this costume and other DIY costume ideas, click here.


6. Mermaid Princess on her throne

Every princess deserves her own beautiful throne! This throne was custom-made by Walkin’ Rollin’ Costumes, a non-profit organization that is dedicated to building free costumes for kids in walkers and wheelchairs. The application process for 2023 is now closed, but we hope this inspires you to create your own throne, let your imagination run wild, and remember that life is better under the sea.


To learn more about Walkin’ Rollin’ Costumes and to see more of their creations, click here.


7. Scuba Diver and Sea Creature

Pets are family and can be included in your Halloween shenanigans. This costume is great for anyone, at any age with a pet willing to wear a costume harness. There is an abundance of sea creature costumes for pets online that are sure to have your furry friend looking fabulous this Halloween.

8. Sailor and Sea Siren

Looks like this sea siren caught her sailor! This couple’s costume can range from sweet to spooky depending on your creative touch. Don’t forget a temporary bicep tattoo to complete the savvy sailor and a starfish hairpiece for the singing siren.


While you can easily purchase new costumes and items for your Halloween looks. We encourage you to think sustainably and hunt to find hidden treasures at your local thrift store to create your magical costumes.

If you use any of these costume ideas, share your photos with us on Instagram or Facebook! @Diventures


About Diventures:

Diventures was founded in 2009, with one location in Omaha, Nebraska. We continue to expand with more than a dozen locations across the U.S. Diventures provides concierge-level customer service for swim lessons, scuba certifications, equipment sales and service, and group and private travel. Diventures is committed to safety and fun in the water, as well as giving back to support local and global communities. Employing hundreds of people and serving thousands of customers per year, Diventures uses their passion, and the power of the water, to impact lives and change the world… and have fun doing it!

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