Zelma R. Long (born c. 1945) is an American enologist and vintner. She is considered to be one of the female pioneers in California wine, and was the first woman to assume senior management of a Californian winery, Simi Winery, of which she was president from 1989 to 1996. Long founded and was the first president of the American Vineyard Foundation to help finance research in enology and viticulture and also founded the American Viticulture and Enology Research Network (AVERN). She is the co-owner of Long Vineyards in St. Helena, California, and the Vilafonte Wine Estate in South Africa. Long has particularly been active in research into viticulture in Washington state.