Teresa Kok Suh Sim (Chinese: 郭素沁; pinyin: Guō Sùqìn; Jyutping: Gwok3 Sou3 Sam3; Pe̍h-ōe-jī: Koeh Sò͘-sim; Pha̍k-fa-sṳ: Kwo̍k Su-tshim; born 31 March 1964) is a Malaysian politician who has served as the Member of Parliament (MP) for Seputeh since November 1999. She served as the Minister of Primary Industries in the Pakatan Harapan (PH) administration under former Prime Minister Mahathir Mohamad from July 2018 to the collapse of the PH administration in February 2020 and Senior Member of the Selangor State Executive Council (EXCO) in the Pakatan Rakyat (PR) state administration under former Menteri Besar Khalid Ibrahim as well as Member of the Selangor State Legislative Assembly (MLA) for Kinrara from March 2008 to May 2013. She is a member of the Democratic Action Party (DAP), a component party of the PH coalition.

Born and raised in Kuala Lumpur, Teresa is a third generation Malaysian of Chinese descent. Kok is a member of the Hakka dialect group and her ancestors were from Huizhou, Guangdong Province, China. She commands Malay, English and Chinese Languages with fluency in Hakka and Cantonese dialects. Kok is a Catholic by religion.^[1]

She graduated with a Bachelor of Communication from Universiti Sains Malaysia (USM) in 1990, and obtained a Master of Philosophy from University of Malaya. Her thesis was on United Malays National Organization (UMNO), titled "Factionalism in Umno During Dr Mahathir's Era (1981–2001)".

Kok writes in weekly column for Chinese newspaper Sin Chew Daily. In 2004, she published a book compiling articles she wrote for the then Chinese daily.

Kok was political secretary to Opposition Leader Lim Kit Siang from 1990 to 1995. In 1995 general election, she contested the Ipoh Barat Parliamentary seat on a DAP ticket but was defeated by the Malaysian Chinese Association (MCA) candidate. Kok resigned as political secretary after that to further her studies and worked part-time at the Secretariat of the Political Leaders Network Promoting Democracy in Burma (PD Burma) from 1996 till 1998.

In the 1999 general election, Kok won the Parliamentary seat of Seputeh in Kuala Lumpur with a majority of 5,200 and was re-elected in 2004 with a majority of 12,895, the largest winning margin among the 13 elected DAP MPs.

In the 2008 general election, Kok retained the Seputeh seat with a majority of 36,492, the largest majority in any constituency and won the Kinrara seat in Selangor State Legislative Assembly at the same time. She was elected in the new Selangor State Executive Council, and was named senior executive councillor who was put in charge of investment, trade and industry to ensure all funds are directed to Malaysians.

In 2013 general election, she won re-election to Parliament, garnering over 86 percent of the formal votes cast in her Seputeh constituency.

Kok was re-elected to Seputeh seat for the fifth term in the 2018 general election but on the ticket of People's Justice Party (PKR) as the move of Pakatan Harapan using a common symbol in the election.

In view of the bad market of palm oil, she launches few palm oil drinking campaign to boost the market demand on the palm oil and further inviting local tour guide to become the ambassadors for palm oil.^[2]

Despite the criticism from activists back home, Teresa Kok kept up with her palm oil activism despite narrow scares at the ballot box. The palm oil industry reciprocated her support by providing indirect campaign support and this drew further brickbats from critics. She admonished member states of the Association of Southeast Asian Nations (ASEAN), should support one another against outside threats to an industry as important to the region as palm oil.^[14] Teresa Kok also opposed World Health Organization (WHO) advice to adult to avoid palm oil in their diet during the Covid-19 outbreak and use alternatives such as olive oil.^[15]