Robert Leonard Larson (September 20, 1898 – October 6, 1986) was a Justice of the Iowa Supreme Court from February 9, 1953 to April 1, 1971, appointed from Johnson County, Iowa. He was previously Attorney General of Iowa from 1947 to 1953.
Larson was born in Fairfield, Iowa and graduated from Parsons College in 1921. He served in the U.S. Navy during World War I. He later attended the University of Chicago before receiving his J.D. degree from the University of Iowa in 1930. While at Iowa he was initiated into Sigma Pi fraternity.
After graduating he practiced law in Iowa City until 1943 while also teaching at public schools in Wapello and Anamosa. From 1937 to 1941 he was the city attorney of Iowa City and on the Johnson County Republican Central Committee.
Larson was a member of the American Legion, Freemasons, Shriners,the American Bar Association, and the Rotary.
He was married and had four children.
Larson began serving as the assistant attorney general of Iowa in 1943. He was appointed as the state's attorney general in 1947 to fill the unexpired term of John M. Rankin. He was elected to the office in 1948 and served until 1953.