Tassajara Zen Mountain Center, Sōtō Zen monastery in the Los Padres National Forest, California, United States

Tassajara Zen Mountain Center, or Zenshinji (Zen Mind Temple), is a Sōtō Zen monastery on 126 acres of the Los Padres National Forest southeast of Carmel-by-the-Sea. Its single-story buildings have horizontal reddish-brown wood siding, corrugated metal roofs on dark round posts, and a large round drum mounted on one wall. Hot springs feed Japanese-style baths, and a steam bath is built over a hot spring in Tassajara Creek.

The San Francisco Zen Center bought the 126-acre property around Tassajara Hot Springs from Robert and Anna Beck in 1967 for $300,000, below market price. Under Shunryu Suzuki, its first abbot, it was renamed Zenshinji (Zen Mind Temple) and became the first Zen monastery outside Asia. The name Tassajara corrupts the Spanish-American Tasajera, from an Esselen word meaning "place where meat is hung to dry".

Daily life follows a rhythm of shared meals and work periods where guests join monks in cooking, gardening, or maintaining the property. The vegetarian kitchen combines Japanese methods with ingredients grown on site.

Access is possible only during the summer months when the grounds open to visitors. Reservations are necessary because guest capacity is limited and the approach follows a long unpaved road.

In 2008 five monks stayed behind evacuation orders during the Basin Complex Fire and saved the monastery; the San Francisco Zen Center then trained its own crew of "fire monks" and fitted the buildings with an external sprinkler system called "dharma rain".