Keltahaf (írska: An Mhuir Cheilteach; velska: Y Môr Celtaidd; kornbreska og devonska: An Mor Keltek; bretónska: Ar Mor Keltiek) er hafsvæði í Norður-Atlantshafi úti fyrir ströndu Suður-Írlands, Kornbretalands og Wales.
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