of Nagy Wines, Santa Maria Valley-Santa Barbara County.
- Quinta da Pacheca
- Quinta Nova de Nossa Senhora do Carmo
- Quinta Vale D. Maria
- Quintessa
- Rack and Riddle Custom Wine Services
- Radburnd Cellars
- Raft Wines
- Ranchero Cellars
- Rarecat Wines
- Raymond Vineyards
- Red Mare Wines
- Reeve Wines
- Rewa Vineyards
- Riboli Family Wines
- Rideau Vineyard
- Ridge Vineyards
- Rivera Vineyards
- Riverbench Winery and Vineyard
- Robert Mondavi Winery
- Robert Renzoni Vineyards
- Romeo Vineyards & Cellars
- Rosa Fierro Cellars
- Rudd Estate
- Rued Winery
- Ryme Cellars
- Saini Vineyards
- Salvestrin Vineyard and Winery
- San Pasqual Winery
- Sangenís i Vaqué
- Sapphire Hill
- Scarecrow Wine
- Scheid Vineyards
- Schramsberg Vineyards & Davies Vineyards
- Scott Harvey Wines
- Scratch
- Seagrape Wine Co.
- SEAWOLF Wines
- Selby Winery
- Ser
- Shannon Ridge Family of Wines
- Share a Splash wine co.
- Shared Notes Wines
- Shokrian Vineyard
- Signorello Estate
- Silver Trident Winery
- Silverado Vineyards
- Simi Winery
- Six Cloves Wines
- Sloan Estate
- Smith & Hook Wine
- Smith Story Wine Cellars
- Snowden Vineyards
- Solminer Wine
- Sonoma-Cutrer Vineyards
- Spann Vineyards
- Spelletich Cellars Family Winery
- Spenker Winery
- St. Clair Brown Winery
- St. Francis Winery & Vineyards
- Starlite Vineyards
- Stefania Wine
- Stephen & Walker Winery
- Sterling Vineyards
- Stevenot Winery
- Stony Hill Vineyard
- Storrs Winery
- SuLei Cellars
- Sunstone Vineyards & Winery
- SUTRO Wine Co.
- Symbiosis Wines
- Taft Street Winery
- Talbott Vineyards
- Te Awanga Estate
- Tenuta Vineyards
- Terah Wine Co.
- Terra d'Oro
- Tessa Marie Wines
- Tessier
- The Hess Collection Winery
- The Prisoner Wine Company
- The Wine Group
- Theopolis Vineyards
- Three Rivers Winery
- Tolenas Winery
- Toquade Wines
- Torres Priorat
- Treasury Wine Estates
- Treasury Wine Estates
- Tres Sabores
- Trinchero Family Estates
- Trombetta Family Wines
- Tulocay Winery
- Turning Tide
- UC Davis Teaching and Research Winery
- Une Femme Wine
- Ursa Vineyards
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