Charles Wesley Leffingwell (December 5, 1840 - 1928) was an author, educator, and Episcopal priest born in Ellington, Connecticut. He was a descendant of Thomas Leffingwell, known as one of the founders of Norwich, Connecticut.
He studied at Union College in Schenectady, New York, and Knox College in Galesburg, Illinois, where he was a member of Beta Theta Pi. He later studied at Nashotah House Theological Seminary before ordination to the diaconate (1867) and priesthood (1868). In 1868, he founded St. Mary's School in Knoxville at the invitation of Henry John Whitehouse, and in 1890 he founded St Alban's School for Boys in the same city.
Leffingwell was editor of The Living Church magazine from 1880 to 1900.
From 1906 he was President of the Leffingwell Rancho in Whittier, California, the land for which he had acquired earlier. His son Charles Warring Leffingwell (sometimes written as Charles W. Leffingwell Jr.) was responsible for the active management of the ranch, which produced fruits and nuts.
His other son, Ernest de Koven Leffingwell was an arctic explorer and geologist. Leffingwell provided partial financial support for his son's explorations.
Leffingwell moved to Pasadena, California (of which Herringshaw's lists him as a founder) in 1908.