Underwater World

Underwater World may refer to:
 * Underwater World, Singapore - oceanarium in Singapore
 * UnderWater World, Queensland - marine mammal park, oceanarium and wildlife sanctuary in Queensland, Australia
 * UnderWater World Guam - oceanarium in Guam
 * Kelly Tarlton's Sea Life Aquarium, formerly Kelly Tarlton's Underwater World - Public aquarium in Auckland, New Zealand
 * Nanjing Underwater World - aquarium in Nanjing, China
 * The Aquarium of Western Australia (AQWA), formerly Underwater World, Perth - aquarium in Hillarys, Western Australia
 * SEA LIFE Minnesota Aquarium - aquarium in Bloomington, Minnesota

In music:
 * Underwater World, a song by the Finnish glam punk band Hanoi Rocks