A couple in their 70s have been stabbed at a home in north Queensland, with the man suffering life-threatening injuries.

Police are questioning a man after the couple suffered stab wounds on Saturday night.

The couple were believed to have been in an altercation with another man at a property in Greenvale, near Townsville, around 8pm (AEST).

Both were taken to Townsville Base Hospital where the man is in a critical condition with life-threatening injuries and the woman is in a stable condition.

Police say all three people know each other but haven’t given any further details with their investigations ongoing.

AAP