Gillian Audrey Mackay (born 1991) is a Scottish Green politician who has served as a Member of the Scottish Parliament (MSP) for the Central Scotland region since the 2021 Scottish Parliament election. She is the first Green MSP ever to be elected in Central Scotland. Raised in Grangemouth, she is a graduate in marine biodiversity and biotechnology from Heriot-Watt University. She has the sensory disorder Ménière's disease.