Pattali Makkal Katchi (பாட்டாளி மக்கள் கட்சி, abbreviated PMK) is a Tamil political party. PMK participated in the National Democratic Alliance until December 2003, and was thus part of the Indian central government 1999-2003. After the 2004 Lok Sabha elections PMK joined United Progressive Alliance.

The PMK founder president is Dr. S. Ramdoss. Ramdoss had earlier worked intensively with the Vanniyar Sangham (Vanniyar Union). PMK is based amongst the Vanniar caste, an OBC community. PMK has advocated the bifurcation of the state of Tamil Nadu, a proposal that was seen as a casteist line. PMK is mainly based in the northern half of the state. Ahead of the 2004 election PMK joined the broad Tamil political front Democratic Progressive Alliance where also Dravida Munnetra Kazhagam, Indian National Congress, Communist Party of India, Communist Party of India (Marxist) and Indian Union Muslim League are members.

After the formation of PMK, Under the leadership of Ramadoss, PMK, because of coalition pressures, could manage to get significant share of power both in the regional government in Tamilnadu and the central government. Dr. Anbumani Ramadoss, the son of S. Ramadoss, is currently the Health Minister in the Government of India.