Major League Baseball Reliever of the Month Award

Major League Baseball honors its best relief pitchers with a Reliever of the Month Award for one pitcher in the American League and one in the National League during each month of the regular season. These awards have been issued since 2017. From 2005 to 2013, MLB honored a single relief pitcher across both leagues with the Delivery Man of the Month Award during each month of the regular season.

Awards by month

MLB previously introduced a Reliever of the Year Award in 2014, awarded to one reliever in the American League and one in the National League. In 2017, MLB added a monthly award, also given to one reliever in each league, for each month of the regular season. The award was sponsored by The Hartford, a Connecticut-based investment and insurance company, from inception through the 2020 season.
The most Reliever of the Month awards won by a single player is ten by Edwin Díaz. He is followed by Josh Hader, Emmanuel Clase, Liam Hendriks, Aroldis Chapman, and Raisel Iglesias.
The table below lists monthly winners; a number in parentheses indicates the number of instances of winning the award for players who have previously won.