Kratos might refer to:
- Kratos (mythology), a figure in Greek mythology, the personification of authority in all its forms
- Kratos (God of War), the "Ghost of Sparta"
- Kratos MS 50, a tool for electron ionization
- Kratos Aurion, a character from the Tales of Symphonia video game
- Operation Kratos, tactics developed by London's Metropolitan Police Service for dealing with suspected bombers, including shooting suspects without warning
- Kratos Defense & Security Solutions, an American company specialising in military and information technology services