The third season of Australian drama television series Prisoner (commonly known as Prisoner: Cell Block H) premiered on Network Ten on 4 February 1981. It consists of 81 episodes and concluded on 11 November 1981.

The season is notable for the conclusion to the tunnel escape storyline which ended the previous season; the departure of Vera Bennett ("Vinegar Tits") when she accepts the position of governor of Barnhurst; the kidnapping of Erica Davidson; the arrival of new prisoners Sandy Edwards, Kate Peterson and former inmate and top dog of H Block – Marie Winter; Bea Smith's amnesia, and later, her mysterious illness which sees her step down as top dog, only to be replaced by Sandy Edwards.