Bradley Thomas Lidge (born December 23, 1976 in Sacramento, California) is a closer for the Philadelphia Phillies of Major League Baseball. Nicknamed "Lights Out", he is the all-time leader in strikeouts per nine innings (12.98 K/9) among pitchers with at least 200 appearances in their career. Lidge throws a four-seam fastball that consistently reaches 95 or 96 miles per hour, as well as a hard, sharp breaking slider that ranges from 85 to 87 mph. He sealed the Phillies' 2008 World Series Championship with the final out, a strikeout of Eric Hinske in Game 5.

Lidge attended Notre Dame. He won the Big East player of the year award during his junior season under coach Paul Mainieri, leading the conference with an 8-2 record and 93 strikeouts in 80.1 innings.

Lidge was a 1st round draft pick by the Houston Astros, taken 17th overall in the 1998 Major League Baseball Draft. He missed parts of his first four professional seasons (at Quad Cities, Kissimmee, Round Rock, and New Orleans) with injuries, including a torn rotator cuff and a broken forearm that threatened his career. Lidge would overcome these injuries, making his debut in the major leagues on April 26, 2002 against the Atlanta Braves, serving as a middle relief pitcher in the Astros' bullpen. He started the only game of his career in September of that year against the Milwaukee Brewers. Lidge went 2-for-2 with a double and 2 RBIs at the plate, but was pulled when he strained an intercostal muscle in his ribcage after pitching three scoreless innings with four strikeouts, two walks and a hit batsman.