Samuel Lewis Francis (1923 - November 4, 1994) was an American painter and printmaker.
Francis was born in San Mateo, California, and studied botany, medicine and psychology at the University of California, Berkeley. He served in the United States Air Force during World War II before suffering a plane crash. He was in hospital for several years, and it was while there that he began to paint. Once out of hospital he returned to Berkley, this time to study art.
Francis was initially influenced by the work of abstract expressionists such as Mark Rothko, Arshile Gorky and Clyfford Still. He spent the 1950s in Paris, having his first exhibition there in 1952. While there he became associated with Tachisme. He later spent time in Japan, and some have seen an influence from Zen Buddhism in his work.
Francis spent some time in Paris executing entirely monochromatic works, but his mature pieces are generally large oil paintings with splashed or splattered areas of bright contrasting colour. Areas of white canvas are often left to show through, and in later works, paint is sometimes confined to the edges of the canvas.