
Robert Arthur (born Robert Paul Arthaud; June 18, 1925 – October 1, 2008) was an American motion picture actor who appeared in dozens of films in the 1940s and 1950s. He appeared in the 1949 war film Twelve O'Clock High as the comic relief–providing Sgt. McIllhenny, in the 1951 Billy Wilder film Ace in the Hole, and in the 1950s television program The Lone Ranger. Arthur was known for playing youthful teenage or young adult roles.
In his later years, Arthur became an activist for gay rights on behalf of senior citizens. He died in Aberdeen, Washington in 2008, aged 83.

Ace in the Hole
1951 · as Herbie Cook

Mildred Pierce
1945 · as High School Boy (uncredited)

Night and Day
1946 · as Customer (uncredited)

Twelve O'Clock High
1949 · as Sergeant McIllhenny

Yellow Sky
1948 · as Bull Run

Nora Prentiss
1947 · as Gregory Talbot

September Affair
1950 · as David Lawrence Jr.

Hellcats of the Navy
1957 · as Freddy Warren

Take the High Ground!
1953 · as Donald Quentin Dover IV

The Devil On Wheels
1947 · as Todd Powell

Nobody Lives Forever
1946 · as Bellhop (uncredited)

Top of the World
1955 · as Skippy McGuire

The Ring
1952 · as Billy Smith

Mother Wore Tights
1947 · as Bob Clarkman

Young Bess
1953 · as Barnaby

Belles on Their Toes
1952 · as Frank Gilbreth

Green Grass of Wyoming
1948 · as Ken McLaughlin

Danger Signal
1945 · as Hotel Boy