Through the 2008 season in MLB, that is Lou Gehrig with 23 career grand slams.
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Lou Gehrig, who played first base for the New York Yankees between 1923-1939, holds the all time MLB grand slam record with 23. Alex Rodriguez tied Lou Gehrig's Record of 23 Grand Slams on June 12th 2012. Alex Rodriguez broke the record in 2013, with his 24th Grand Slam.
"Steady Eddie" Murray hit 19 grand slams in his Major League Baseball career.
Lou Gehrig holds the record for most grand slams in a career at 23, but Alex Rodriguez has a reasonable chance of breaking that. Check the link below for a list of every MLB player who has hit at least two grand slams in a career. This includes Tony Cloninger, a pitcher who hit two grand slams in one game -- and hit only nine other home runs in his entire career.
Alex Rodriguez set the major league record for grand slam home runs in September 2013 with his 24th. He had been tied with Lou Gehrig with 23 grand slams since June 12, 2012. They are followed on the list by Manny Ramirez with 21, and Eddie Murray with 19. In fifth place is Willie McCovey, who holds the National League record for career grand slams with 18.
Robin Ventura hit 18 grand slam home runs in his career which ties him for fifth place on the all-time MLB list. Only Alex Rodriguez (25), Lou Gehrig (23), Manny Ramirez (21) and Eddie Murray (19) hit more grand slams. Ventura is tied with Willie McCovey, whose 18 grand slams were the most ever in National League history.