Joseph Darley Kennedy (May 24, 1979 – November 23, 2007) was an American Major League Baseball left-handed pitcher.

He pitched from 2001 to 2007 for the Tampa Bay Devil Rays, Colorado Rockies, Oakland Athletics, Arizona Diamondbacks, and the Toronto Blue Jays.

The team was eliminated after a first-round 3–1 loss to Kahulia East Maui in the West Region Tournament in San Bernardino.

[1] He graduated from El Cajon Valley High School, where he played baseball as well as basketball, volleyball and football, and attended Grossmont College before entering the major league draft.

[5] On July 13 of that year, Kennedy, along with pitcher Jay Witasick, was traded by the Rockies to the Oakland Athletics for outfielder Eric Byrnes and minor league infield prospect Omar Quintanilla.

Kennedy pitched in the bullpen for Oakland before being pressed into the starter role in September when Rich Harden was injured.

Despite struggling in spring training with an ERA above 11.00, Kennedy was named the fifth starter for the Athletics at the start of the 2007 season.

On January 15, 2008, it was announced by the medical examiner that Kennedy had died of hypertensive heart disease with degeneration of the mitral valve.