Tetrarch
- Alex Comfort
- Ancient Thessaly
- Byzantine army
- Galatia
- HMS Tetrarch
- Herod Antipas
- Herod Archelaus
- Herodian Tetrarchy
- Light Tank Mk VII Tetrarch
- Military rank
- Philip the Tetrarch
- Portrait of the Four Tetrarchs
- Royal Navy
- Royal Phalanx
- Tetrarch (band)
- Tetrarch (novel)
- Tetrarchy
- Tetricus (disambiguation)
- The Tetrarch