Robert Clifford Brown (July 15, 1910 – November 6, 1966), known professionally as Washboard Sam, was an American blues musician and singer.

Brown’s date and place of birth are uncertain; many sources state that he was born in 1910 in Walnut Ridge, Arkansas, but the researchers Bob Eagle and Eric LeBlanc suggest that he was born in 1903 or 1904, in Jackson, Tennessee, on the basis of Social Security information. He was reputedly the half-brother of Big Bill Broonzy. He moved to Memphis, Tennessee, in the 1920s, performing as a street musician with Sleepy John Estes and Hammie Nixon.He moved to Chicago in 1932, performing regularly with Broonzy and other musicians, including Memphis Slim and Tampa Red, in many recording sessions for Lester Melrose of Bluebird Records.

In 1935, he began recording in his own right for both Bluebird and Vocalion Records, becoming one of the most popular Chicago blues performers of the late 1930s and 1940s, selling numerous records and playing to packed audiences. He recorded over 160 tracks in those decades. His strong voice and songwriting talent overcame his stylistic limitations.