The Alexander Valley (Wappo: Unutsawaholmanoma, "Toyon Bush Berry Place")[4] is a Californian American Viticultural Area (AVA) just north of Healdsburg in Sonoma County.

A modern era of quality wine production began in the late 1960s when a new owner of Simi Winery sought to revive the area's long winemaking history.

In the 1970s, a new wave of producers, such as Chateau Souverain and Jordan Vineyard & Winery, descended upon the area and started making wines that received critical and consumer acclaim.

[9] The Alexander Valley covers a broad expanse of land east of the Russian River consisting of the watershed that runs southeast from the Mendocino County line down to the boundaries of the Chalk Hill AVA.

[10] During the day, the Alexander Valley is one of the warmest areas in Northern California but at night experiences a wide diurnal temperature variation that offers cool climate conditions.

[11] A characteristic associated with Alexander Valley wines is a rich, fleshy mouthfeel and a degree of voluptuousness due to the area's generally warm climate and ability to sufficiently ripen the grapes.

[5] In the early 21st century, there was controversy when the Alexander Valley Association of farmers, wineries and property owners objected to a proposal for a tribal casino on land owned by the Pomo people.

In 1998, the association had been able to block a large winery expansion proposed by Kendall-Jackson, but in the dispute with the Pomo casino, federal and state laws granted the tribe the right to develop the land in any way they wished.