Andrew Jason Ashby (born July 11, 1967) is a former Major League Baseball starting pitcher who played for the Philadelphia Phillies, Colorado Rockies, San Diego Padres, Atlanta Braves, and Los Angeles Dodgers. Listed at 6' 1", 180 lb., Ashby batted and threw right-handed. He was born in Kansas City, Missouri.
Ashby attended Park Hill High School in Kansas City and played baseball with the Crowder Roughriders at Crowder College. He was signed as an undrafted free agent in 1986 by the Phillies, with whom he made his Major League debut in 1991.
On June 15, 1991, Ashby struck out three batters on nine pitches in the fourth inning of a 3–1 loss to the Cincinnati Reds; Ashby became the 15th National League pitcher and the 24th pitcher in Major League history to accomplish the nine-strike/three-strikeout half-inning. He was acquired by the Colorado Rockies in the 1993 expansion draft, but after compiling an 0–4 record with an 8.50 ERA, he was dealt to the San Diego Padres at the end of the season.