Irving Conrad Ashby (December 29, 1920 – April 22, 1987) was an American jazz guitarist renowned for his contributions to jazz and swing music. Born in Somerville, Massachusetts, Ashby began playing guitar at the age of nine. His professional career took off in 1940 when he joined Lionel Hampton's band, where he played on the hit "Flying Home." In 1947, Ashby replaced Oscar Moore in the Nat King Cole Trio, marking a significant step in his career. He also briefly substituted for drummer Charlie Smith in the Oscar Peterson Trio, maintaining a lineup similar to the Cole Trio's until 1958. After his tenure with the Peterson Trio, Ashby focused on session work, collaborating with artists such as Norman Granz, Sheb Wooley, LaVern Baker, Howard Roberts, B.B. King, Louis Jordan, and Pat Boone. Besides the guitar, Ashby was also skilled in playing the upright bass. He passed away in Perris, California, at the age of 66.