Dr. Spencer Roane Atkinson (September 2, 1886 - October 31, 1970) was an American orthodontist and a graduate of Angle School of Orthodontia. He is best known for establishing The Spencer R. Atkinson Library of Applied Anatomy at University of the Pacific Arthur A. Dugoni School of Dentistry. The library consists of collection of 1,400 human skulls collected over past 40 years. Atkinson is also known for developing the Universal Appliance in 1960s which led to eventual formation of the Unitek Division of 3M Company.