Thomas John Guiry (born October 12, 1981) is an American actor.
Guiry was born in Trenton, New Jersey and attended St. Gregory the Great school in Hamilton Township, Mercer County, New Jersey from kindergarten through eighth grade, and then high school at Notre Dame High School in Lawrenceville, New Jersey. In 1989, he briefly starred in a small role as a basketball team captain in the episode titled "Loosiers" (originally aired February 28) from the second season of The Wonder Years. His most notable appearances were in The Sandlot, U-571, The Mudge Boy, Black Hawk Down, Mystic River, and The Four Diamonds. Guiry played Jimmy Donnelly on the NBC drama The Black Donnellys.