John Joseph Grigas (August 19, 1920 – May 19, 2000) was an American football player. He played college football for the Holy Cross Crusaders football team from 1940 to 1942 and professional football in the National Football League (NFL) from 1943 to 1947. He was selected as a second-team All-American in 1941, a first-team All-NFL player in 1944, and led the NFL in all-purpose yards in 1944.