Peter Colot, 55, a retired Navy lieutenant commander who later worked for an electronics firm and a chemical company here, died Sunday at his home in Alexandria. He had cancer.

Cmdr. Colot, who was born in South River, N.J., and graduated from the U.S. Naval Academy at Annapolis in 1947, served briefly in North China and then became an aviator. His assignments included flying with a patrol squadron from Quonset Point, R.I., and Iceland and service in California and Hawaii.

He also was a flight instructor at the Naval Air Station at Pensacola, Fla., and a member of a photo reconnaissance squadron at Suitland, Md. He was attached to the staff of the Icelandic Defense Force at Keflavik, Iceland, at the time of his retirement in 1966.

Cmdr. Colot and his family then moved to Alexandria. He worked for PRD Electronics and then for Ocean Chemicals. He retired about 1976.

Survivors include his wife, the former Audur Josdottir of Alexandria; four daughters, Hildur, of Boston, Mass., Gerdur, of Reykjavik, Iceland; Thora, of Alexandria, and Freyja Lynn, of Burke; two brothers, Robert, of Matawan, N.J., and Raymond, of Austrailia, and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions in Cmdr. Colot's name to the Children's Hospital National Medical Center, Washington.