Rogelio Ulloa Martínez (born November 5, 1918) is a former pitcher in Major League Baseball who played briefly for the Washington Senators during the 1950 season. Listed at 6' 0", 180 lb., Martínez batted and threw right-handed. He was born in Cidra, Matanzas Province, Cuba. Martínez was nicknamed Limonar, after the modest little town in his native Matanzas where he started to play baseball.
In one major league season, Martínez posted a 0-1 record with a 27.00 ERA in two appearances, including one start, giving up four runs on four hits and two walks while striking out none in 1 ⅓ innings of work.
As of 2008, Martínez (91) is recognized as one of the oldest living major league ballplayers.