Lester Dorr (born Harry Lester Dorr; May 8, 1893 - August 25, 1980) was an American actor who between 1917 and 1975 appeared in well over 500 productions on stage, in feature films and shorts, and in televised plays and weekly series. His extensive filmography attests to his versatility as a supporting actor and reliability as a bit player. Although Dorr's screen roles are at times credited, the great majority of his work is uncredited. Dorr was cast in more than 250 films in just the 1930s alone.

Dorr continued to appear regularly in studio productions throughout the 1940s, but with reduced frequency when compared to the preceding decade; nevertheless, he still added more than 140 Hollywood films to his résumé in that decade. His work on the big screen decreased even further in the 1950s as acting opportunities increased on television. He was, though, cast in at least 45 feature films and shorts during the 1950s. By the late 1940s and early 1950s, programming in the rapidly expanding medium of television attracted the talents of many experienced personnel in the film industry, including Dorr.

As with his film career, Dorr’s 15 years of being cast in television series consisted predominantly of brief appearances on screen and portraying characters who had relatively few lines. Yet, his characterizations on television, like in films, were highly diverse and can be seen in at least 84 episodes of Westerns, crime and detective series, courtroom and hospital dramas, adventure programs, and sitcoms of the period.