Pattali Makkal Katchi (பாட்டாளி மக்கள் கட்சி, abbreviated PMK), a Tamil, caste based 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.

Now PMK is part of the broad Tamil political front Democratic Progressive Alliance where also Dravida Munnetra Kazhagam, Indian National Congress, Marumalarchi Dravida Munnetra Kazhagam, Communist Party of India, Communist Party of India (Marxist) and Indian Union Muslim League are members.

The PMK founder president is Dr. S. Ramdoss. Ramdoss had earlier worked intensively with the Vanniyar Sangham (Vanniyar Union).

PMK is dominated by the Vanniyar caste, an OBC community. PMK has advocated the bifurcation of the state of Tamil Nadu, a proposal that was seen as casteist. PMK is mainly based in the northern half of the state.

Ramdoss has given moral support to LTTE.