June Lockhart (born June 25, 1925 in New York City) is an American television and film actress best known for her roles as the mothers on Lassie and Lost in Space.

She also appeared as a regular in the soap opera General Hospital in several different years, and as Dr. Janet Craig on Petticoat Junction, replacing Bea Benaderet, who died of cancer during the show's run. Lockhart was the only actress or actor to have starred in three hit series during the 1960's.

She was the only child of two actors: Canadian-born Gene Lockhart, who came to fame on Broadway in 1933 in Ah, Wilderness!, and his UK-born wife, Kathleen Lockhart, who appeared with her husband in many of his stage plays and several movies, including A Christmas Carol, in which June, as a teen, appeared. June also played supporting parts in films as Meet Me in St. Louis, Sergeant York, and The Yearling.