Seabury Cone Mastick (July 19, 1871 in San Francisco, California – August 21, 1969 in Manchester, England) was an American lawyer and politician from New York.
from University of California Hastings School of Law in 1894, and A.M. from Oberlin College the same year.
On October 1, 1896, he married Agnes Eliza Warner (1872–1963), a fellow student at Oberlin from Arlington, New York.
From 1917 to 1920, he served in the United States Navy, eventually becoming a lieutenant commander.
He was Chairman of the New York State Commission for the Revision of the Tax Laws from 1930 to 1938.