Dr. Tan Seng Giaw is a Malaysian politician from the Democratic Action Party. He was born on 26 May 1942 in Kota Baru, Kelantan. After attending Primary and High School in Kelantan and Penang respectively, he furthered his education at Plymouth College and Leeds University, England. His multi-cultural academic and social background has resulted in Seng Giaw being fluent in Mandarin, English, Bahasa Malaysia, and competent in the writing of Malay in the Jawi script. Seng Giaw's academic qualifications include a M.B.Ch. B. (Leeds), D. Obs. R.C.O.G, M.R.C.P (UK) and finally a M.D. honours (Leeds) in 1976.
An active participant in student activities, he represented the Leeds Medical School on the British Medical Student's Association for five years, and was a founding member of the Chinese Society of the University of Leeds, where he held the office of Society President during 1965–66.
Over the years, Tan has gathered a wide portfolio of medical experience, having worked at various hospitals (both international and local), private practice clinics and a short period in the Royal Malaysian Army. Tan is working as a Specialist Dermatologist at the Chinese Maternity Hospital Medical Centre.
His social activities include the office of Pengerusi Kehormat of Persatuan Murid-murid Tua, Chung Ling for the states of Selangor, Negeri Sembilan, Pahang and Kuala Lumpur.
Tan's political involvement began in 1976, during which he served the people of Kepong on behalf of Dr. Tan Chee Khoon. He is the Democratic Action Party's National Vice-chairman and Member of Parliament for the constituency of Kepong.
In 1972, Dr. Tan married Oon Hong Geok, a paediatrician and has two daughters. His wife used to be active in the political scene and represented Taman Aman, Petaling Jaya as a state assemblywoman.