Ninja may refer to:
- The recurring job.
- The recurring magic type.
- The recurring enemy.
- The weapon from Final Fantasy IV.
- The job for the Rogue class from Final Fantasy XIV.
- The helmet from The Final Fantasy Legend.
- The gauntlet from Final Fantasy Legend II.
- The weapon from Final Fantasy Legend III.
- The enemy family from Final Fantasy Dimensions.
- The ability type from Final Fantasy Record Keeper.
ninja was a covert agent or mercenary in feudal Japan who specialized in unorthodox warfare. The functions of the ninja included espionage, sabotage, infiltration, and assassination, and open combat in certain situations.A