Blácaire mac Gofrith (died 948), in Old Norse Blákári Guðrøðsson, was King of Dublin. Son of Gofraid ua Ímair, he was a great-grandson of Ímar, ancestor of the Uí Ímair kindred which dominated the Scandinavianised and Norse-Gael regions of the British Isles in the tenth century.According to the Annals of Clonmacnoise, Blácaire came to rule Dublin when his cousin Amlaíb Cuarán went to Northumbria to assist Blácaire's brother Amlaíb, or Olaf Guthfrithson, King of York in 940.