Ian A. Krol (born May 9, 1991) is an American professional baseball pitcher for the Saraperos de Saltillo of the Mexican League.

[2][3] After missing time due to an elbow injury, Krol made his professional debut on August 27, starting for the AZL Athletics.

Krol played most of 2010 with Single-A Kane County Cougars, where in 24 games (23 starts), he went 9–4 with a 2.65 ERA, striking out 91 in 1182⁄3 innings, and was a mid and post-season all-star.

Krol missed the first three months with an elbow injury, and was pitching in a rehab assignment in the Arizona League before he was suspended for the rest of the season—more than two months—for a tweet that included a graphic "gay slur along with some other offensive language".

[10] He made his major league debut the next day against the Mets, striking out the side in one scoreless inning of work.

After a short stint with the Triple-A Syracuse Chiefs at the end of August, Krol returned to the Nationals for September.

On November 20, 2015, the Tigers traded Krol and pitcher Gabe Speier to the Atlanta Braves in exchange for outfielder Cameron Maybin and cash considerations.

On January 29, 2019, Krol signed a minor league contract with the Cincinnati Reds that included an invitation to spring training.

[21] On December 14, 2020, Krol signed a minor league contract with the Detroit Tigers with an invitation to spring training.

[27] On March 18, 2022, Krol signed a minor league contract with the San Diego Padres, which included an invitation to spring training.

Krol made 21 appearances for the main team down the stretch, pitching to a 1–1 record and 3.86 ERA with 15 strikeouts in 21 innings of work.

On March 6, 2023, Krol signed with the Tecolotes de los Dos Laredos of the Mexican League.