Kerwin Joseph Danley (born May 25, 1961 in Los Angeles, California) is an umpire in Major League Baseball who has worked in the National League (NL) from 1992 to 1999 and throughout both leagues since 2000. Danley has worked the American League Division Series five times (2000, 2001, 2004, 2006, and 2008). He also umpired in the 2007 All-Star Game in San Francisco. For the 2008 MLB season, Danley is on the umpire crew consisting of Charlie Reliford (crew chief), Greg Gibson, and Brian Runge.
Danley was the first base umpire for the game between the San Francisco Giants and the San Diego Padres on August 4, 2007. In the top of the second inning at San Diego, Barry Bonds of the Giants hit his 755th career home run off Clay Hensley, tying Hank Aaron for first all-time.
On April 26, 2008, Danley was behind home plate umpiring a game between the Los Angeles Dodgers and the Colorado Rockies when he was hit in the jaw by a 96 mph Brad Penny fastball that went over the head of catcher Russell Martin. Danley was carried off the field in an ambulance, but play eventually resumed. During the sixth inning, Vin Scully reported that Danley was doing well. Danley was released from the hospital at early the next morning and returned to the field in early June.