Lillian Diana Gish (October 14, 1893 – February 27, 1993) was an American stage, screen and television actress whose film acting career spanned 75 years, from 1912 to 1987. She was a prominent film star of the 1910s and 1920s, particularly associated with the films of director D.W. Griffith, including her leading role in Griffith's seminal Birth of a Nation (1915). Her sound-era film appearances were sporadic, but included a memorable role in the 1955 cult thriller Night of the Hunter. She did considerable television work from the early 1950s into the 1980s, and closed her career playing opposite Bette Davis in the 1987 film The Whales of August.

The American Film Institute (AFI) named Gish 17th among the greatest female stars of all time. She was awarded an Honorary Academy Award in 1971, and in 1984 she received an AFI Life Achievement Award.

Lillian Diana Gish was born in Springfield, Ohio, the elder sister of actress Dorothy Gish. The sisters' mother, Mary Robinson McConnell (an Episcopalian), began acting in order to support the family after her husband, James Lee Gish (who was of German Lutheran descent) abandoned them. When Lillian and Dorothy were old enough, they joined the theatre, often traveling separately in different productions. They also took modeling jobs.