Palmaz Vineyards is a Californian winery in the Napa Valley, primarily dedicated to Cabernet Sauvignon production.

The estate is located on what was once the Cedar Knoll Vineyard Company, a pre prohibition winery, founded in 1881 by Henry Hagen, one of the pioneers of wine production in the Napa Valley.

[1] Palmaz Vineyards is noted for having the largest wine cave in the Napa Valley,[2] totaling 100,000 square feet.

Palmaz Vineyards' winemaking and aging takes place within the living rock of Mount George, in a multi-leveled series of tunnels and domes.

The height of the wine cave is equivalent to an 18-storey building, providing the vertical range needed for true gravity-flow winemaking.