PMK may refer to:
- Pattali Makkal Katchi, a political party in Tamil Nadu, India
- People's Movement of Kosovo, a political organization
- Popular Mechanics for Kids, a Canadian TV series
- Pairwise Master Key in the IEEE 802.11i-2004 protocol
- Piperonyl methyl ketone, a chemical compound
- PMK gas mask, a Soviet made single-filter gas mask.
- Palm Island Airport, IATA airport code