Orca is a 1977 horror film directed by Michael Anderson and produced by Dino De Laurentiis and starring Richard Harris and Charlotte Rampling. The film was one of a long line of marine-related horror-disaster films that followed the success of 1975's Jaws. In this film, the antagonist is a Killer Whale or Orca.

Robert Towne provided an uncredited script rewrite.

Taglines:

• The killer whale is one of the most intelligent creatures in the universe. Incredibly, he is the only animal other than man who kills for revenge. He has one mate, and if she is harmed by man, he will hunt down that person with a relentless, terrible vengeance - across seas, across time, across all obstacles.
• Terror just beneath the surface.

After witnessing his mate and child's death from Nolan's hands, Orca, the killer whale, goes on a rampage in the fishermen's arbor. Under the villagers's pressure, Nolan, Rachel and an indian sails after the great beast, who will bring them on his own turf. Written by M Lalonde

The fisherman and owner of a fishing vessel, Captain Nolan (Richard Harris), becomes aware of the economical value of an orca whale alive through the lecture of the biologist Rachel Bedford (Charlotte Rampling) and decides to capture one to pay the mortgage of his ship. However, the operation fails and he kills a pregnant female whale and its offspring. The male mate orca seeks revenge against Captain Nolan and his crew, jeopardizing the fishing community of the coastal town. Written by Claudio Carvalho, Rio de Janeiro, Brazil

A killer whale's pregnant mate is maimed & killed by Captain Nolan (Richard Harris) during a capture attempt. The angry male orca, after grieving the loss of its mate & offspring, seeks revenge against Captain Nolan. He causes serious damage to a fishing town where Nolan is hiding out, and lures Nolan, Rachel Bedford (a biologist) and a Native American to an ice field for a final confrontation...on HIS terms. Written by Derek O'Cain