Jason Aaron Hammel (born September 2, 1982) is an American professional baseball pitcher for the Kansas City Royals of Major League Baseball (MLB). He previously played for the Tampa Bay Devil Rays/Rays, Colorado Rockies, Baltimore Orioles, Oakland Athletics, and Chicago Cubs.
Hammel was born in Greenville, South Carolina, but raised in Port Orchard, Washington. He attended South Kitsap High School in Port Orchard, Washington, and led the team to a 20–1 season in 2000 as the number one starter in the rotation. Hammel was drafted in the 23rd round by the Seattle Mariners, but opted instead to attend Treasure Valley Community College in Ontario, Oregon.. He played collegiate summer league ball for the Wenatchee AppleSox of the West Coast League.