John Stanley Ragin (May 5, 1929 - April 14, 2013) was an American actor. He was best known for his role as uptight bureaucratic Dr. Robert Asten, M.E. in the TV series Quincy, M.E. (1976–83).

Ragin appeared in mostly smaller supporting roles in television series such as in Alfred Hitchcock Presents, The Invaders, Star Trek: The Next Generation and smaller roles in movies such as Earthquake and The Parallax View.

He played Walter Cramer in the 1974 TV series "Sons and Daughters". He had a short-term stint as Dr. Grant Jameson on the daytime soap opera Santa Barbara in 1990 and again in 1991. Ragin died on April 14, 2013 at age 83.