Aaron Steven Laffey (born April 15, 1985) is a Major League Baseball starting pitcher for the Cleveland Indians. He made his major league debut with the Indians in 2007.

In Laffey's first pro season in 2003, he was with the Burlington Indians of the Rookie level and went 3-1 in 9 games (4 starts) while striking out 46 in 34 innings pitched. In 2004, while with the Single-A Mahoning Valley Scrappers, Laffey went 3-1 with a 1.24 ERA in 8 starts which earned him a promotion to the Single-A Lake County Captains 3-7 with a 6.53 ERA in 19 games. He started the 2005 season with Lake County and went 7-7 with a 3.22 ERA in 142.1 innings pitched and was called up to the Double-A Akron Aeros for one game in which he picked up the victory by going 5 innings and allowed 2 runs while striking out 6. Laffey started the 2006 year with the Singel-A Advanced Kinston Indians which he was 4-1 with a 2.18 ERA in 10 games (4 starts). His performance earned him a promotion to Double-A Akron where he wnet 8-3 with a 3.53 ERA in 19 games, all starts. In 2007, he pitched 6 games with Akron and he went 4-1 2.31 with a ERA in 6 starts. He was promoted to the Triple-A Buffalo Bisons and went 7-3 with a 3.28 ERA before his call up to the majors.

On August 4, 2007, Laffey made his major league debut against the Minnesota Twins; he went 5.1 innings allowing 6 hits, 3 runs, 1 walk, and 1 strikeout while losing the game. In his second start on August 9, against the Chicago White Sox, Laffey picked up his first major league victory. He went 5.2 innings allowed 6 hits, 4 runs, 3 walks, and struck out 4 in the Indians 7-5 victory. On August 10, a day after Laffey's first major league victory, he was demoted to Triple-A Buffalo. On August 25, Laffey was recalled to pitch against the Kansas City Royals. Laffey won again, going 6 innings, allowing 8 hits, only 2 runs, walked only 1, and struck out 4. Laffey went into spring training in 2008, competing for the fifth spot in the rotation, however Cliff Lee won the job and Laffey was sent back to Buffalo, but was brought back up following an injury to Jake Westbrook. Laffey was named American League Rookie of the Month for the month of May. Laffey had a 3-2 record and an 0.79 ERA for the month. Opponents batted .220 against him in May over a 34 inning span.