Kirsty Hay (born 9 February 1972 in Glasgow, Scotland as Kirsty Addison) is a Scottish curler, a two-time (1992, 1995) and a three-time Scottish women's champion (1995, 1996, 1998).
She played for Great Britain at the 1998 Winter Olympics, where the British team finished in fourth place.
At 17, she won her first national junior title and went on to skip her team to gold at the . This was the first occasion that a Scottish women's team had ever held a world title in curling.
Her sister Karen Addison is also a curler. They won the together.
She began curling at the age of 12.