The Clifton Conference was a gathering of religious leaders held by William N. Hartshorn at his summer home in Clifton, Massachusetts. Five conferences are known to have been held, between 1901 and 1908.
The most historically impactful Clifton conference is the fifth one, where religious leaders discussed the educational, religious, and social issues facing African Americans after the end of slavery in the United States. The Conference was organized by the International Sunday-School Association (ISSA), of which Hartshorn was the director.