Jesse Donald Knotts (July 21, 1924 – February 24, 2006) was an American actor and comedian. He is widely known for his role as Deputy Sheriff Barney Fife on the 1960s sitcom The Andy Griffith Show, for which he earned five Emmy Awards.^: 18 He also played Ralph Furley on the sitcom Three's Company from 1979 to 1984. He starred in multiple comedic films, including leading roles in The Incredible Mr. Limpet (1964) and The Ghost and Mr. Chicken (1966). In 2004, TV Guide ranked him number 27 on its "50 Greatest TV Stars of All Time" list.

Knotts was born in West Virginia, the youngest of four children. In the 1940s, before earning a college degree, he served in the United States Army and in World War II. While enlisted, he chose to become a ventriloquist and comedian as part of a G.I. variety show, Stars and Gripes.

After the army, he got his first major break on television on the soap opera Search for Tomorrow, where he appeared from 1953 to 1955. He gained wide recognition as part of the repertory company on Steve Allen's variety show, where he played the "extremely nervous man" in Allen's mock "Man in the Street" interviews. In 1958, Knotts made his film debut in the adapted version of No Time for Sergeants.

Knotts was cast as deputy Barney Fife on television's The Andy Griffith Show, which ran from 1960 to 1968. He reprised the character on other shows, such as The Joey Bishop Show and Return to Mayberry. Knotts won five Emmy Awards for Best Supporting Actor in a Television Comedy.