Han Ki-Joo (Korean: 한기주; Hanja: 韓基周; born April 29, 1987 in Gwangju, South Korea) is a right-handed relief pitcher who plays for the Samsung Lions of the KBO League.

Han, the youngest player on the South Korean team roster, pitched 7 shutout innings, struck out 12, and allowed only 3 hits to win over Australia in the round-robin.

During the 2008 Beijing Olympics Baseball tournament in August 2008, Han earned the notoriety of being a "choker", "suspense writer", and subject to many other unflattering nicknames due to his failure to close out games in the late innings.

Usually a solid closer for his Pro team, Han blew the lead in the 9th inning of the game against the United States, then proceeded to make things interesting once again against Japan a few days later before being yanked with runners on 2nd and 3rd.

In May 2009, after blowing four saves within one month with a 6.08 ERA, Han was demoted from his role as Tigers closer, losing the job to Yoon Suk-Min.