Aramis Nin Ramírez (pronounced /ʌrˈɑːmɪs/ or /ərˈɑːmɪs/) (born June 25, 1978 in Santo Domingo, Dominican Republic) is an All-Star Major League Baseball third baseman for the Chicago Cubs. He started his professional career with the Pittsburgh Pirates in 1998 before being traded to the Cubs in 2003. On November 12, 2006, Ramírez signed a five-year deal with the Cubs with an option for 2012.

On November 7, 1994, at the young age of 16, Ramirez signed his first contract as a free agent with the Pittsburgh Pirates. On May 26, 1998 at age 19, he made his first major league debut with the Pirates, becoming the youngest player in the MLB at that time.

Although showing great potential, Ramirez struggled in his first three seasons, splitting playing time between the Pirates and Triple A Nashville. Playing with the Pirates for an entire season for the first time in 2001, Ramirez had a tremendous year at bat hitting 34 home runs and an earning an impressive 112 RBIs to go along with a .300 Batting Average. That year however, in stark contrast to his batting performance, Ramirez had 25 errors, ranking second to last in errors and finishing last in fielding percentage at .945, the lowest among all third basemen in the MLB. Ramirez also had the lowest zone rating in the National League at .745. In 2002, His batting performance dipped, ending the season with a Batting Average of .234 and 18 home runs. Notable: On April 17 of that season, he was ejected from a game versus the Milwaukee Brewers at Miller Park after having charged the pitcher's mound and throwing his batting helmet at Brewers pitcher Ben Sheets, earning him a suspension from April 23 through April 30.