The Esselen are a Native American people belonging to a linguistic group in the hypothetical Hokan language family, who are indigenous to the Santa Lucia Mountains of a region south of the Big Sur River in California. Prior to Spanish colonization, they lived seasonally on the coast and inland, surviving off the plentiful seafood during the summer and acorns and wildlife during the rest of the year.

The Esalen Institute, commonly called Esalen, is a non-profit American retreat center and intentional community in Big Sur, California, which focuses on humanistic alternative education. The institute played a key role in the Human Potential Movement beginning in the 1960s. Its innovative use of encounter groups, a focus on the mind-body connection, and their ongoing experimentation in personal awareness introduced many ideas that later became mainstream.