Gregory Alan "Greg" Mackie (OAM) (born 1959) is a South Australian cultural advocate, entrepreneur and leader who has worked to promote the arts and culture in Australia.
He was co-founder and was managing director of independent bookshop Imprints Booksellers (1984—2007), served on many public bodies, including Arts SA, the Adelaide City Council and Adelaide Writers' Week, and founded the Adelaide Festival of Ideas in 1999.
As of 2019 he is CEO of the History Trust of South Australia.