Thomas James Lawless (born December 19, 1956) is an American former Major League Baseball player who played between 1982 and 1990, appearing with the Cincinnati Reds, Montreal Expos, St. Louis Cardinals, and Toronto Blue Jays.

Lawless grew up in Erie, Pennsylvania, attending Strong Vincent High School and Penn State Behrend, where he played baseball from 1975 to 1978.

"[2] On May 10, 1989, while with the Toronto Blue Jays, Lawless' ninth-inning single broke up a no-hit bid by Mark Langston of the Seattle Mariners.

[3] A fast and highly skilled baserunner, Lawless struggled to hit major league pitching and retired in 1990.

On November 16, 2009, Lawless was named the new manager for the Lancaster JetHawks, the Class A Advanced affiliate of the Houston Astros, for the 2010 season.