The Octopus: A California Story, 1901 novel by Frank Norris based on conflict between farmers and railroad barons

Decoy Octopus, a character in the video game Metal Gear Solid

Octopus card, a smartcard used in Hong Kong

Doctor Octopus, a Spider-Man supervillain

Octopus, a spare second-stage demand valve and mouthpiece fed by its own pressure hose from the cylinder in scuba diving; see Diving regulator

Octopus, a sea creature

The Octopus, 1940 exposé by Elizabeth Dilling

The Octopus Project (software) is a software package for time-dependent density functional theory density-functional theory

Octopus (Human League album)

The Octopus, another name for S. S. Millard's film Is Your Daughter Safe?

Octopus (genus), a genus encompassing octopuses

Octopus Micro Finance Suite, a software suite

The Octopus Project, an indietronica band from Texas

Octopus (album), a Gentle Giant album

Octopus (The Bees album)

The Octopus, Italian mafia TV series originally entitled La Piovra

OCTOPUS (fictional organisation), a criminal organization in the video game From Russia with Love

Octopus (politics), a form of government identified by Danny Casolaro

Octopus Cards Limited, the company operating the Octopus card

Octopus (yacht), a superyacht belonging to Paul Allen

"Octopus" (song), a Syd Barrett song, and his only solo single

Octopus, the European name of Name This Game, an Atari 2600 video game

Octopussy (disambiguation)

Octopus (film), 1998 film by Gou Suzuki