Reynolds Joseph "Ren" Kelly (November 18, 1899 – August 24, 1963) was an American pitcher in Major League Baseball who played in one game for the Philadelphia Athletics on September 18, 1923. In that game, he pitched seven innings in relief, gave up seven hits, two earned runs, while walking four batters, and striking out one. Kelly was born and raised in San Francisco, and was the California High School player of the year for 1919, when he attended San Francisco's Polytechnic High School.