Poseidon, the main villain of the second manga season / third anime season in Saint Seiya

Posidonius, famous ancient Greek astronomer and geographer

The Poseidon Adventure (1972 film), based on the novel

Poseidon (horse), the champion racehorse

Beyond the Poseidon Adventure, a 1979 film sequel to the original (1972) version

Poseidon (film), 2006 remake of the 1972 film

Poseidon drowning detection system

The Poseidon Adventure (2005 film), made-for-television film also based on the novel

Poseidon Resorts

The Poseidon-2 radar altimeter onboard Jason 1

UGM-73 Poseidon, a US Navy nuclear ballistic missile system

The Poseidon radar altimeter onboard TOPEX/Poseidon

Poseidon bubble, an Australian stock market bubble

a German research vessel of marine research institute IFM-Geomar at Kiel University

S.S. Poseidon, a fictional ocean liner based on the novel by Paul Gallico

HMS Poseidon (1929), a P-class submarine of the British Royal Navy

Master of Atlantis - Poseidon, a computer game

Poseidon for UML, UML software

Poseidon (moon), informal name formerly borne by Jupiter VIII, now called Pasiphaë, from 1955 to 1975

An internet mail server named Poseidon in the Olympia School District in Olympia, Washington, United States