Kratos may refer to:
- The Greek word κράτος krátos, 'power', which is the second root in words like aristocrat and democracy. Its mythological personification was the god Kratos, a son of Styx.
- Kratos MS 50, a tool for Electron ionization
- Kratos Aurion, a character from the Tales of Symphonia video game
- Kratos (God of War), the main protagonist in the video game series, God of War
- Operation Kratos, the shoot to kill policy of London's Metropolitan Police Service
- Kratos Defense & Security Solutions
- a black cockerel