Sir Hamish Grenfell Hay (8 December 1927 – 7 September 2008) was a New Zealand politician, who served as Mayor of Christchurch for fifteen years, from 1974 to 1989.

[2] In 1947, he joined the staff of Hay's, a department store, which was founded by his father and later became a publicly listed company.

Like his father, he was a strong proponent of a town hall (as a performing arts centre) for Christchurch.

[7] In 1995, Hay returned to the political scene, representing Christchurch North on the Canterbury Regional Council until 2001.

[11] In the 1998 Birthday Honours, she was made a Companion of the New Zealand Order of Merit (CNZM) for services to the community.

[2] Lady Hay moved to her family home in Akaroa after the 2011 Christchurch earthquake and lived there until she started to need care.