Marcus Welby, M.D. is an American medical drama television program that aired on ABC from September 23, 1969, to July 29, 1976. It starred Robert Young as a family practitioner with a kind bedside manner and James Brolin as the younger doctor he often worked with, and was produced by David Victor and David J. O'Connell. The pilot, A Matter of Humanities, had aired as an ABC Movie of the Week on March 26, 1969.

Robert Youngas Dr. Marcus Welby
James Brolinas Dr. Steven Kiley
Elena Verdugoas Consuelo Lopez
Pamela Hensleyas Janet Blake
Sharon Glessas Kathleen Faverty
Jan-Michael Vincentas Ritchie Manning
Walter Brookeas Dr. Roy Staples
Anne Baxteras Myra Sherwood
John Luptonas Vincent M. Dunn
Lynn Carlinas Helen Stewart
John Wilder