Ji-man Choi (Hangul: 최지만; Hanja: 崔志萬; Korean pronunciation: "Chwey Jee Mahn"; born May 19, 1991) is a South Korean professional baseball player who currently plays in the Seattle Mariners organization. He made his professional debut in 2010 with the Arizona League Mariners. Choi joined Seattle's Class-A Advanced High Desert Mavericks later in the season. After his first season, he was named the Arizona League's Most Valuable Player. Choi plays both first base and catcher, standing at 6 feet 1 inch (1.85 m) and weighing 195 pounds (88 kg). He bats left-handed, while throwing right.
Choi was signed by the Seattle Mariners before the 2010 season. He was sent the their Arizona League affiliate to begin his professional baseball career. With the Arizona League Mariners, Choi batted .378 with 23 runs scored, 51 hits, 15 doubles, two triples, one home run, 23 runs batted in (RBIs), and 10 stolen bases in 39 games played. Amongst league batters, Choi was second in on-base percentage (.459), and slugging percentage (.541). Choi also played 11 games with the Class-A Advanced High Desert Mavericks of the California League that season. On August 24, in a game against the Inland Empire 66ers, Choi hit his first and only home run with the Mavericks. With the Mavericks, he batted .302 with seven runs scored, 13 hits, one double, one triple, one home run, and seven RBIs. Combined between the two teams, Choi batted .360 with 30 runs scored, 64 hits, 16 doubles, three triples, two home runs, and 30 RBIs in 50 games played. On defense between the two clubs, he played 34 games as a first baseman and 10 as a catcher, committing two errors; and making 39 assists, and 326 putouts. After the season, he was named the Arizona League Most Valuable Player. The Seattle Mariners named Choi as their top position player on their Arizona League affiliate.
Choi played for the Jackson Generals of the Class AA Southern League in 2013. He was named to the World Team roster of the All-Star Futures Game.
Choi was added to the Mariners 40-man roster on November 20, 2013.
On April 17, 2014, Choi was suspended for 50 games after testing positive for methandienone.