Ryan Joseph Sweeney (born February 20, 1985, in Cedar Rapids, Iowa) is a Major League Baseball outfielder for the Oakland Athletics.

Sweeney graduated from Xavier High School in Cedar Rapids in 2003.

At the beginning of the 2007 season, Ryan was ranked by Baseball America as the No. 1 Prospect in the Chicago White Sox organization. He had originally signed to play collegiately for Tony Gwynn at San Diego State. However, he signed with the White Sox as he was taken in the 2nd round of the 2003 MLB Draft.