William Frederick Pester (born Friedrich Wilhelm Pester, July 18, 1885 – August 12, 1963) was a German-born American pioneer of hippie lifestyles in California in the first half of the twentieth century, known as "the Hermit of Palm Springs".
He was described as epitomizing "the strong link between the 19th century German reformers and the flower children of the 1960s", and inspired the eden ahbez song "Nature Boy", recorded by Nat King Cole and others.