Ronald Joel Flores (born August 9, 1979) is an American former Major League Baseball (MLB) left-handed relief pitcher who played with the Oakland Athletics from 2005 to 2007.

[2] The Oakland Athletics selected Flores in the 29th round (870th overall pick) of the 2000 Major League Baseball draft.

He pitched a career-high four shutout innings for his first big league win on June 29, 2006 against the San Diego Padres.

On December 12, 2007, Flores signed a minor league contract with the St. Louis Cardinals, uniting him with older brother Randy.

He became a free agent at the end of the season and signed a minor league contract with the Cincinnati Reds, only to be released by the organization on April 1, 2009.