Allyn Morgan Joslyn[1] (July 21, 1901 – January 21, 1981) was an American character actor of theatre, radio, film and television, specializing in comic roles.

[1] He studied drama with Professor E. C. Durfee at Chestnut Hill Academy in Philadelphia,[6] and later attended Columbia University.

[8] It was his acclaimed performance as Robert Law—a character reputedly modeled on screenwriter Charles MacArthur[9]—in the 1935 hit Broadway comedy Boy Meets Girl that first caught Hollywood producer-director Mervyn LeRoy's eye, leading to Joslyn making his 1937 screen debut, alongside that of Lana Turner, in LeRoy's They Won't Forget.

[11][3] From 1935 until her death in 1978, Joslyn was married to Dorothy Yockel, Philadelphia-born stage and radio actress—and fellow fishing enthusiast[12]—with whom he had frequently co-starred during the late 1920s.

[4] On January 21, 1981, at age 79, Joslyn died of heart failure at the Motion Picture & Television Country House and Hospital in Woodland Hills, Los Angeles.