Ryan Stewart Theriot (/ˈtɛrioʊ/; born December 7, 1979) is a former Major League Baseball shortstop and second baseman.
A shortstop in college, Theriot was converted to second base for his major league debut, but played shortstop throughout the 2007–2009 seasons. Theriot then was switched back to second base to make room for the rookie Starlin Castro, who took his spot at shortstop on May 7, 2010. Theriot also played third base, right field, and left field.
Theriot graduated from Broadmoor High School in Baton Rouge, Louisiana in 1998. While there he played three seasons on the basketball team as a point guard and four seasons on the baseball team as a shortstop. He was a highly decorated baseball player, so he opted to not play basketball during his senior year of high school to focus on his baseball skills. While at Broadmoor he played alongside childhood friends, Mike Woods and Trae Duncan, and together they set Louisiana High School Athletic Association history by becoming All American infielders from the same high school. They all later became 1st team All State for class 4A at third base, shortstop, and second base, becoming the first trio to earn such awards.