Octonauts is an animated children's television series, produced by Silvergate Media for the BBC channel CBeebies, and based on the children's books written by Vicki Wong and Michael C. Murphy.

The show follows an underwater exploring crew made up of stylized anthropomorphic animals, a team of eight adventurers who live in an undersea base, the Octopod, from which they go on undersea adventures with the help of a fleet of aquatic vehicles. Although its technology is fictional, the exotic creatures and locations that the crew encounter are based on real marine animals in their natural habitats. The show's subject matter has been compared to that of Star Trek and Thunderbirds blended with Jacques Cousteau.

The show was animated in Ireland by Brown Bag Films for its first four series. The show was renewed for a fifth series in 2018, with Canada's Mainframe Studios taking over animation work. A Netflix-original spinoff, subtitled Above & Beyond, was released in September 2021, and featured the Octonauts venturing onto more land-based habitats of the natural world.

In March 2023, five new episodes under the original Octonauts branding and format were released via the BBC iPlayer.