Stefan Artur Schnabel (February 2, 1912 – March 11, 1999) was a German-American actor who worked in theatre, radio, films and television. After moving to the United States in 1937 he became one of the original members of Orson Welles's Mercury Theatre repertory company. He portrayed Dr. Stephen Jackson on the CBS daytime TV series Guiding Light for 17 years.

In March 1937, Schnabel moved to New York and began working in radio. Among the first of the more than 5,000 radio shows on which he performed was The Shadow, starring Orson Welles. Schnabel joined Welles's Mercury Theatre repertory company and appeared as Metellus Cimber in its inaugural Broadway production, a landmark modern-dress production of Shakespeare's Julius Caesar (1937–38) that evoked Nazi Germany. When Welles created the CBS radio series, The Mercury Theatre on the Air, Schnabel performed on episodes including the legendary broadcast, "The War of the Worlds".