Santa Ynez is a census-designated place (CDP) in the Santa Ynez Valley of Santa Barbara County, California.

The Santa Ynez Valley is located in Santa Barbara County, California, between the Santa Ynez Mountains to the south and the San Rafael Mountains to the north. The Santa Ynez River flows through the valley from east to west. The Santa Ynez Valley is separated from the Los Alamos Valley, to the northwest, by the Purisima Hills, and from the Santa Maria Valley by the Solomon Hills. The Santa Rita Hills separate the Santa Ynez Valley from the Santa Rita and Lompoc Valleys to the west.