Jang Ik-jae (Korean: 장익제; born 14 February 1973), also known as I.J. Jang, is a South Korean professional golfer.

Jang plays on the Japan Golf Tour, where he has won three times.

No.	Date	Tournament	Winning score	Margin of victory	Runners-up
1	29 May 2005	Mitsubishi Diamond Cup Golf	−5 (74-69-64-68=275)	3 strokes	Shingo Katayama, Ryoken Kawagishi
2	29 Apr 2012	The Crowns	−8 (71-69-66-66=272)	2 strokes	Steven Conran, Yoshikazu Haku
3	3 May 2015	The Crowns (2)	−10 (66-69-68-67=270)	4 strokes	Tomohiro Kondo, Hideto Tanihara, Kazuhiro Yamashita

Japan Golf Tour playoff record (0–1)

No.	Year	Tournament	Opponent	Result
1	2011	The Crowns	Brendan Jones	Lost to birdie on first extra hole

No.	Date	Tournament	Winning score	Margin of victory	Runner(s)-up
1	19 Oct 2003	KTRD Open	−14 (69-70-67-68=274)	1 stroke	Kim Dae-sub
2	26 Oct 2003	SBS Dongyang Fire Cup	−13 (71-70-67-67=275)	1 stroke	Cho Hyun-jun
3	28 Aug 2005	Samsung Benest Open	−13 (70-69-71-65=275)	1 stroke	Park No-seok
4	25 Sep 2005	Kumho Asiana Open	−9 (71-70-70-68=279)	3 strokes	Jun Tae-hyun, Kang Kyung-nam

No.	Date	Tournament	Winning score	Margin of victory	Runners-up
1	21 Apr 2023	Nojima Champion Cup Hakone Senior Tournament	−9 (68-65=133)	1 stroke	Hisao Ahara, Keiichiro Fukabori, Nobuhiro Masuda

"T" = Tied

Amateur

• Eisenhower Trophy (representing South Korea): 1994, 1996

Professional

• World Cup (representing South Korea): 2005

• Jang Ik-jae at the Japan Golf Tour official site
• Jang Ik-jae at the Korean Tour official site (in Korean)
• Jang Ik-jae at the Official World Golf Ranking official site