Bautista hit .360 with four doubles, 11 home runs and 23 RBIs in 23 games for Toronto, which sits four games behind first-place New York in the AL East standings as of Thursday afternoon.
The slugger, who missed five games because of neck spasms, still led the AL in homers for the fifth straight month dating back to July 2010. According to the Elias Sports Bureau, he's the first Major Leaguer to do so since Jimmie Foxx accomplished the feat from June 1933 to April 1934.
Bautista leads all of baseball with 20 long balls this season, and he is batting .360, with 40 RBIs.
He also led the Majors in slugging percentage (.791) and on-base percentage (.476) in May, reaching base in 21 of 23 games.
This marks the second time in Bautista's career he's received the award in consecutive months. He was honored in July 2010 (along with Minnesota's Delmon Young) and August 2010.