Eugene "Gene" Lockhart (July 18, 1891 – March 31, 1957) was a Canadian Academy Award-nominated character actor, singer, playwright and popular composer.

Born in London, Ontario, Lockhart made his professional debut at the age of six when he appeared with The Kilties Band of Canada. At the age of 15, he was appearing in sketches with actress Beatrice Lillie. Lockhart was educated in various Canadian schools and at the Brompton Oratory School in London, England. He also played football for the Toronto Argonauts.

Lockhart had a long stage career; he also wrote professionally and taught acting and stage technique at the Juilliard School of Music in New York City. He had also written theatrical sketches, radio shows, special stage material, song lyrics and articles for stage and radio magazines.

He made his Broadway debut in 1916, in the musical The Riviera Girl. He was a member of the travelling play The Pierrot Players (for which he wrote the book and lyrics). This play introduced the song, The World Is Waiting for the Sunrise, for which Lockhart wrote the lyrics along with Canadian composer Ernest Seitz. (The song was subsequently made popular by Les Paul and Mary Ford in the 1950s.) He also wrote and directed the Broadway musical revue Bunk of 1926. He also sang in Die Fledermaus for the San Francisco Opera Association.

However, Lockhart is mostly remembered for his film work. He made his film debut in the 1922 version of Smilin' Through, as the Rector, but did not made his sound debut until 1934 in the film By Your Leave, where he played the playboy Skeets. Lockhart subsequently appeared in more than 300 motion pictures. He often played villains, including a role as the treacherous informant Regis in Algiers, the American remake of Pepe le Moko, which gained him an Academy Award nomination for Best Supporting Actor. He also played the suspicious Georges de la Trémouille, the Dauphin's chief counselor, in the famous 1948 film, Joan of Arc, starring Ingrid Bergman. He had a great succession of "good guy" supporting roles including Bob Cratchit in A Christmas Carol and the judge in Miracle on 34th Street. He is also fondly remembered as the Starkeeper in the 1956 film version of Rodgers and Hammerstein's Carousel. Playing a bumbling sheriff, he appeared in His Girl Friday opposite Cary Grant and Rosalind Russell. He also appeared in the movie The Sea Wolf (1941), adapted from the novel by Jack London, as a ship's doctor. His last film role was that of the Equity Board President in the 1957 film Jeanne Eagels.

On Broadway, Lockhart originated the role of Uncle Sid in Eugene O'Neill's only comedy, Ah, Wilderness!, and took over from Lee J. Cobb as Willy Loman, during the original run of Death of a Salesman.

Lockhart died from a coronary thrombosis at the age of 65 in Santa Monica, California. He is buried next to his wife in Holy Cross Cemetery in Culver City, California.

Lockhart was the husband of Kathleen Lockhart, the father of June Lockhart and the grandfather of Anne Lockhart.

He has two stars on the Hollywood Walk of Fame at 6307 Hollywood Boulevard, one for motion pictures and one for television.

Gene Lockhart was born on July 18, 1891, in London, Ontario, Canada, the son of John Coates Lockhart and Ellen Mary (Delany) Lockhart. His father had studied singing and young Gene displayed an early interest in drama and music. Shortly after the 7-year-old danced a Highland fling in a concert given by the 48th Highlanders' Regimental Band, his father joined the band as a Scottish tenor. The Lockhart family accompanied the band to England. While his father toured, Gene studied at the Brompton Oratory School in London. When they returned to Canada, Gene began singing in concert, often on the same program with Beatrice Lillie. His mother encouraged his career, urging him to try for a part on Broadway. Lockhart went to America. At 25, he got a part in a New York play in September, 1917, as Gustave in Klaw and Erlanger's musical "The Riviera Girl." Between acting engagements, he wrote for the stage. His first production was "The Pierrot Players" for which he wrote both book and lyrics and played. It toured Canada in 1919 and introduced "The World Is Waiting for the Sunrise" (words by Lockhart, music by Ernest Seitz), which became a very popular ballad.. "Heigh-Ho" (1920) followed, a musical fantasy with score by Deems Taylor and book and lyrics by Lockhart. It had a short run (again, with him in the cast). Lockhart's first real break as a dramatic actor came in the supporting role of Bud, a mountaineer moonshiner, in Lula Vollmer's Sun Up (1939) (TV). This was an American folk play, first presented by The Players, a theatrical club, in a Greenwich Village little theater in 1923. After great notices it moved to a larger house for a two-year run. During this engagement, in 1924 at the age of 33, Lockhart married Kathleen Lockhart (aka Kathleen Arthur), an English actress and musician. Gene meanwhile also appeared in a series of performances presented by The Players in New York theaters: as Gregoire in "The Little Father of the Wilderness"; as Waitwell in "The Way of the World," as Gumption Cute in "Uncle Tom's Cabin", and as Faust in "Mephisto." The Lockharts' daughter, June Lockhart, was born in 1925. She would eventually appear regularly in the television series "Lassie" (1954) and "Lost in Space" (1965). In 1933, Gene and Kathleen were featured in "Sunday Night at Nine," a radio program presented at New York's Barbizon-Plaza Hotel. Meanwhile, Lockhart was keeping busy writing articles for theatrical magazines and a weekly column for a Canadian publication, coaching members of New York's Junior League in dramatics, lecturing on dramatic technique at the Julliard School of Music, and directing a revival of "The Warrior's Husband"--a formidable schedule. It amused him as he said that, "in spite of [the amount of work in a typical day] I don't get thin." Lockhart had by this time taken on the appearance that audiences would see again and again in films--short and plump with a chubby, jowly face and twinkling blue eyes. In 1933, he played Uncle Sid in the Theatre Guild's production of 'Eugene ONeill (I)'s comedy "Ah, Wilderness!" co-starring George M. Cohan. This was the role that was to bring Lockhart stardom and lead to a contract with RKO Pictures and his first film, By Your Leave (1934). O'Neill wrote to Lockhart: "Every time your Sid has come in for dinner I've wanted to burst into song, and every time you've come down from that nap I've felt the cold gray ghost of an old heebie-jeebie." The acclaim for his acting in "Ah, Wilderness!" allowed Lockhart to proceed to Hollywood and remain there almost without interruption. However, he was back on Broadway in December, 1949, when he took over the part of Willy Loman in the New York production of "Death of a Salesman." Lockhart appeared in over 125 films. Though he often played upright doctors, judges and businessmen, and was in real life described as an amiable and gentle soul, Lockhart is perhaps best remembered on film as a villain who usually ends up cowering in a corner whimpering pitifully before getting his just desserts, a scene he played to the hilt in such movies as Algiers (1938) (for which he was nominated for an Oscar), Blackmail (1939), Geronimo (1939), Northern Pursuit (1943), and Hangmen Also Die! (1943). Late on Saturday, March 30, 1957, Lockhart suffered a heart attack while sleeping in his apartment at 10439 Ashton Avenue in West Los Angeles. He was taken to St. John's Hospital and died on Sunday afternoon, March 31. He is buried in Holy Cross Cemetery.