David McCallum (September 19, 1933 - September 25, 2023) was a Scottish actor and musician. He gained wide recognition in the 1960s for playing secret agent Illya Kuryakin in the television series The Man from U.N.C.L.E. His other notable television roles include Carter in Colditz (1972–1974) and Steel in Sapphire & Steel (1979–1982). Beginning in 2003, McCallum gained renewed international popularity for his role as NCIS medical examiner Dr. Donald "Ducky" Mallard in the American television series NCIS. On film, McCallum notably appeared in The Great Escape (1963).

He was born in Glasgow, Scotland, to David McCallum Sr., an orchestral violinist, and Dorothy (née Dorman), a cellist. He began his acting career in the early 1950s, appearing in British television shows and films. In 1957, he moved to Hollywood to pursue a career in American cinema.