KSP may refer to:
- Karolinska Scales of Personality, a Swedish personality questionnaire
- Kentucky State Police
- Kentucky State Penitentiary
- Kerbal Space Program, a space flight simulator game
- Kerala Socialist Party
- Keyword Services Platform
- Korea Socialist Party
- Key signing party
- Solubility product constant (Ksp)
- The filename extension of the KSpread spreadsheet application (.ksp)
- Korean Survival Project, a local version of the formerly international MMORPG