Reentrant or re-entrant can refer to:
Sciences Reentrancy (computing) in computer programming Reentrant mutex in computer science Reentry (neural circuitry) in neuroscience Concave polygon, AKA reentrant polygon Reentry into the atmosphere of an orbiting body
Topography Re-entrant, a type of terrain feature commonly known as a draw. Salients, re-entrants and pockets in military tactics
See also Reentrant dysrhythmia, a type of cardiac arrhythmia Reentrant tuning in music