
Karl Swenson (July 23, 1908 – October 8, 1978) was an American theatre, radio, film, and television actor. Swenson is remembered for his role as the doomsayer in the diner in Alfred Hitchcock's The Birds (1963) and as the voice of Merlin in Disney's The Sword in the Stone (1963). On television, he had numerous credits in guest roles on various shows, especially Westerns, including episodes of Bonanza, The Virginian, and Gunsmoke. He had a major recurring role as Walnut Grove founder Lars Hanson on Little House on the Prairie (1974 - 1978).
Swenson also had roles in The Prize (1963), Major Dundee (1965), The Sons of Katie Elder (1965), The Cincinnati Kid (1965), Seconds (1966), Hour of the Gun (1967), ...tick...tick...tick... (1970), The Wild Country (1970), Vanishing Point (1971) and Ulzana's Raid (1972).
Born in Brooklyn, New York of Swedish parentage, he originally planned to be a doctor and studied at Marietta College before pursuing acting. Swenson appeared extensively on the radio from the 1930s through the 1950s. He entered the film industry in 1943 with two wartime documentary shorts, December 7 and The Sikorsky Helicopter. Swenson was married to actress Joan Tompkins. He died of a heart attack at Charlotte Hungerford Hospital in Torrington, Connecticut on October 8, 1978, shortly after filming the Little House on the Prairie episode in which his character dies. The episode aired on October 16, 1978, eight days after Swenson's death. He was interred at Center Cemetery in New Milford, Connecticut.

The Sword in the Stone
1963 · as Merlin (voice)

The Birds
1963 · as Le prophète de malheur ivre au bar

Judgment at Nuremberg
1961 · as Heinrich Geuter

How the West Was Won
1962 · as Train Conductor (uncredited)

Vanishing Point
1971 · as Clerk

Seconds
1966 · as Dr. Morris

The Sons of Katie Elder
1965 · as Doc Isdell

Ulzana's Raid
1972 · as Rukeyser

North to Alaska
1960 · as Lars Nordqvist

Hour of the Gun
1967 · as Dr. Charles Goodfellow

The Cincinnati Kid
1965 · as Mr. Rudd

Major Dundee
1965 · as Captain Waller

Lonely are the Brave
1962 · as Rev. Hoskins

The Gallant Hours
1960 · as Bill Bailey

… tick… tick… tick…
1970 · as Frank Braddock Sr.

Flaming Star
1960 · as Dred Pierce

The Prize
1963 · as Hilding

The Hanging Tree
1959 · as Tom Flaunce