Cornelius Leo "Connie" Simmons (March 15, 1925 – April 15, 1989) was an American professional basketball player.

A 6'8" forward/center from Flushing High School in New York City, Simmons played ten seasons (1946–56) in the National Basketball Association as a member of the Boston Celtics, Baltimore Bullets, New York Knicks, Syracuse Nationals and Rochester Royals.

He was the second player to enter the NBA without having played in college, after Tony Kappen.

[1] Connie was the brother of professional basketball and baseball player Johnny Simmons.

[2] This biographical article relating to a United States basketball player, coach, or other figure born in the 1920s is a stub.