Adam Troy Dunn (born November 9, 1979, in Houston, Texas) is a Major League Baseball first baseman and outfielder for the Washington Nationals. He bats left-handed and throws right-handed.

At six feet, six inches (198 cm) in height and weighing 275 pounds, Dunn was given the nickname "Big Donkey" and is one of the National League's most feared sluggers. On July 4, 2009, he became the 123rd player to hit 300 career home runs.

Dunn was a standout quarterback at New Caney High School in Texas. After graduating from high school, Dunn attended the University of Texas and focused on football as a quarterback. The Cincinnati Reds drafted Dunn in the second round of the 1998 Major League Baseball Draft.