The Tan Sri Datuk Ong Kee Hui Postgraduate Chemistry Medal is given annually to the most outstanding chemistry postgraduate thesis by a Malaysian at a local university or institution of higher learning. The MSc and PhD theses are assessed by a panel appointed by the council.

The following are the winners of the Tan Sri Datuk Ong KeeHui Postgraduate Chemistry Medal:

• Yeoh Guah Huah(1974)
• S.J. Tata(1975)
• Yeoh Hock Hin(1976)
• Dr Boey Peng Lim(1978)
• Dr Lau Chee Heng(1979)
• Mok Soon Lian(1979)
• Dr Sow Huan Puah(1980)
• Dr Chuah Cheng Hock(1983)
• Ooi Cheng Keat(1984)
• Dr Gee Ping Tou(1985)
• Tan Yan Khon(1986)
• Dr Choo Yuen May(1988)
• Richard Wong Chee Seng(1989)
• Ooi Kuan San(1991)
• Dr Wan Daud Bin Wan Yusoff(1992)
• Ooi Kay Eng(1992)
• Dr Mahiran Basri(1993)
• Dr Lee Kuan Chong(1994)
• Dr Zainab Bte Ramli(1995)
• Dr Siew Wai Lin(1995)
• Kartini Bte Noorsal(1996)
• Dr Yoganathan Kanagasundaram(1997)
• Yap Chiew Lin(1998)
• Dr Nor Hadiani Ismail(1999)
• Dr Pok Fen Wei(2001)
• Dr Sim Kooi Mow(2001)
• Norazah Binti Basar(2002)
• Dr Felix Moh Mee Ho(2003)
• Dr. Choo Yeun Mun (2004)
• Dr Subramaniam Gurusamy (2005)
• Dr Ha Sie Tiong (2006)
• Dr Farook Ahmad (2007)
• Dr Sim Yoke Leng (2008)
• Dr Vejayakumaran Padavettan (2009)
• Dr Irene Ling (2010) 
• Dr Gaanty Pragas a/l Maniam (2011)