PSK may refer to:
- Partiya Şoreşa Kürdistan, A Kurdish Separatist guerrilla group in Turkey
- Property Solutions Korea, a real estate consulting and development company in South Korea
- Phase-shift keying, a digital modulation technique
- Pre-shared key, a method to set encryption keys
- Phi Sigma Kappa, a fraternity
- Österreichische Postsparkasse (P.S.K.), Austrian Postal Savings Bank
- Polysaccharide-K, a natural medicine