Shawn Mark Tolleson (born January 19, 1988) is an American professional baseball pitcher for the Tampa Bay Rays of Major League Baseball (MLB). He previously played for the Los Angeles Dodgers and Texas Rangers.

Tolleson played High School baseball at Allen High School in Allen, Texas. A four-year letter winner for head coach Paul Pool, he led Allen to regional quarterfinals as sophomore and regional semifinals as junior. Both seasons Tolleson was chosen THSCA All-State, 1st-Team All-District and All-Area. Posted 9–2 with 0.42 ERA and 137 strikeouts in 89 innings as sophomore and went 7–4 with 0.89 ERA and 112 strikeouts in 80 innings as junior for the co-District Champion Allen Eagles. Came into his senior season as a First-team 2006 preseason All-America by Collegiate Baseball, but missed most of senior season due to Tommy John surgery.

While at Baylor University Tolleson compiled a 9–13 record in 2008-2010 after being redshirted as a freshman in 2007. He saw his most success as a RS Freshman going 6–4 in 14 starts and having a team-high two complete game shutouts. Named an HM All-Big 12 selection in 2008 and 2010 and was also awards Big 12 Pitcher of the Week honors twice in his college career.

Tolleson was drafted by the Los Angeles Dodgers in the 30th round of the 2010 MLB Draft out of Baylor University. In 2010 with the Ogden Raptors, he had 17 saves in 25 appearances and a 0.63 ERA. He was selected to the Pioneer Baseball League post-season All-star team. In 2011, he appeared in 14 games with the Great Lakes Loons, five with the Rancho Cucamonga Quakes and 38 with the AA Chattanooga Lookouts. He was the primary closer at each level, working in 57 total games with a 7–2 record, 1.17 ERA and 25 saves. He was the Dodgers Minor League Pitcher of the Year in 2011. After beginning 2012 with Chattanooga, he was promoted to the AAA Albuquerque Isotopes on May 11.

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