Crimthann or Cremthann may refer to:
- Crimthann mac Fidaig, legendary High King of Ireland of the 4th century AD
- Crimthann Nia Náir, legendary High King of Ireland of the 1st century AD
- Crimthann Coscrach, legendary High King of Ireland of the 3rd century BC
- Crimthann mac Énnai, 5th century AD King of Leinster
- Crimthann mac Áedo, 7th century AD King of Leinster
- Crimthann Srem mac Echado, 6th century AD King of Munster
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