Agoston Haraszthy (; , ; August 30, 1812, Pest, Hungary – July 6, 1869, Corinto, Nicaragua) was a Hungarian-American traveler, writer, town-builder, and pioneer winemaker in Wisconsin and California, often referred to as the "Father of California Viticulture," or the "Father of Modern Winemaking in California". One of the first men to plant vineyards in Wisconsin, he was the founder of the Buena Vista vineyards (now Buena Vista Carneros) in Sonoma, California, and an early writer on California wine and viticulture.