Roy Barcroft (7 September 1902 - 28 November 1969) was an American character actor famous for playing villains in B-Westerns and other genres. Noted film critic Leonard Maltin acclaimed Barcroft as "Republic Pictures' number one bad guy".

After serving in World War I, Roy Barcroft spent most of the 1920s and early 1930s moving from job to job. It was in the 1930s, after he moved to California with his wife, that he found his calling while acting in amateur theatrical productions. In 1937 he was appearing in bit parts in various genres, but by 1938 he was in westerns, where he became a well-known (and memorable) "heavy". Roy would alternate among Monogram, Universal, Columbia and other studios. In 1943, however, he signed an exclusive ten-year contract with Republic Pictures and became the convincing, and tireless, menace to all the good people in the West. He also did more than sneer at the likes of 'Don 'Red Barry, Bill Elliot (III), Sunset Carson and Allan Lane (I). Roy acted in Fighting Seabees, The (1944), which starred John Wayne (I). He was the Purple Martian in Purple Monster Strikes, The (1945) and Capt. Mephisto in Manhunt of Mystery Island (1945), and who can forget his Retik, The Moon Menace. from the classic Radar Men from the Moon (1952)? Roy even played the good-natured marshal in Oklahoma! (1955). It was westerns, though, that were his bread and butter, and he knocked out a lot of them over the years. Outlaws of Cherokee Trail (1941), Riders of the Rio Grande (1943) and Sun Valley Cyclone (1946) were but a few of the "B" westerns Roy turned out. Off-screen, he was known as one of the nicest, kindest and most helpful people anyone would want to meet, with a terrific sense of humor. More than once, many a leading hero type such as Barry or Elliot would find that their hairpieces would mysteriously disappear before they were to put them on prior to shooting. When the era of the "B" westerns started to fade out, Roy's volume of work also slowed. He appeared in a handful of films, but his movie career had stalled by the end of 1957. He moved into the small screen with roles in TV westerns and also a recurring role in the Walt Disney production of "Adventures of Spin and Marty, The" (1955). In the early 1960s he worked in a couple of movies, but his resurgence began in the mid-'60s when he appeared in low-budget films like Billy the Kid versus Dracula (1966). Roy would make some better films, such as Texas Across the River (1966) and Reivers, The (1969).

Incredibly prolific American character actor of low-budget Westerns and serials, most frequently seen as a villain. He was born in either Weeping Waters, Nebraska or Crab Orchard, Nebraska, depending on the source (the two towns are within a few miles of each other), to a farm family. In 1917, he joined the Army at the age of 15 and was wounded in action in France. At 16, he began traveling the U.S. doing odd jobs as a ranch hand, roughneck, and railway laborer. He sailed to the Mediterranean on a freighter as a seaman, then reenlisted in the Army. While stationed in Hawaii, he learned to play a number of musical instruments and afterwards made his living playing in dance bands. In 1929, he took his family to California, where his military background gained him work as a soldier-extra in films. Uninterested in movies, he continued doing various jobs, from salesman to tunnel digger. As a sales tool, he took up dramatics to improve his speaking voice and in 1937 was spotted in a little theatre production and given a part in a Republic serial, S.O.S. Coast Guard (1937). His rough voice and demeanor were perfect for the 'heavy' roles that filled every B-Western and action picture, and Barcroft spent the next thirty years averaging an incredible ten films per year. He found a minor kind of stardom as the title villain in several Republic serials of the 1940s, and spent his later years playing more bad guys on television Westerns. He died of cancer at the Motion Picture Country Hospital in 1969. Barcroft had three children.