Bay of Plenty man is in a critical condition after a stabbing early today.

Another man had been arrested in connection with the stabbing, which happened at a house in Katikati, 35km northwest of Tauranga, about 2.30am, Detective Senior Sergeant Greg Turner said.

He would appear in Tauranga District Court later today on an assault charge, but police said it was likely further charges would be laid.

The stabbed man, who was in a critical condition, was undergoing surgery at Tauranga Hospital.