Matt Duffy Baseball Academy is a baseball training facility located at 293 Libbey Industrial Parkway, Unit 150 (Rear) in Weymouth, MA. Owned by former Major League Baseball and Nippon Professional Baseball infielder Matt Duffy of Milton, MA. The Academy is also home to JT3 Fitness, a strength and performance gym that provides full access to players who want to better themselves and develop further their athletic training.

The Matt Duffy Baseball Academy is home to the MDB Knights, providing ages 9U - 18U travel baseball club opportunities in the Select Baseball League. Matt Duffy Baseball focuses on long-term player development, a consistent approach to coaching across all levels of play, and developing a broader knowledge of baseball.