A prominent charity worker, she was also a company director of The Hall residential home at Thornton-le-Dale.
Born in South Wales to a farming family, she became Mayor of Scarborough and was given the Freedom of the borough and the status of honorary alderman in 2005.
She had trained as a nurse, at St Thomas’s Hospital, London, in the 1940s, and worked through the blitz before becoming a sister caring for wounded soldiers.
She married a consultant anaesthetist, Dr Richard Mackenzie, who died weeks before she was first elected a councillor in 1974.
A renowned fundraiser, Mrs Mackenzie was a leading official of the RNLI, organiser of the Scarborough Hospital annual ball, and raised large sums for the NSPCC and Save the Children. She was also noted for her collection of hats.
She is survived by two daughters, Jane and Joanna.