The deal includes an invitation to major league camp.
Mientkiewicz, 34, is a .271 hitter in 11 seasons with the Minnesota Twins, Boston Red Sox, New York Mets and Yankees, Kansas City Royals and Pittsburgh Pirates. He hit .277 with a .374 on-base percentage in 125 games with the Pirates last season.
His .996 career fielding percentage in 955 games is tops among active first basemen.
The Dodgers envision Mientkiewicz as a possible backup to first baseman James Loney and a left-handed bat off the bench. Mientkiewicz also appeared in 33 games at third base and 10 in right field for Pittsburgh in 2008.
Jerry Crasnick covers baseball for ESPN.com.