Charles Sumner Hamlin (August 30, 1861 – April 24, 1938) was an American lawyer and politician who served as the first chairman of the Federal Reserve from 1914 to 1916.

He previously served as the United States assistant secretary of the treasury from 1893 to 1897, and again from 1913 until 1914 when President Woodrow Wilson nominated him as one of the original members of the Federal Reserve Board.

His mother was born in England to Irish parents, while his father, a coal dealer, was from Massachusetts.

He also published pamphlets on statistical and financial subjects, including an Index Digest of Interstate Commerce Laws (1907) and the Index Digest of the Federal Reserve Bulletin (1921).

[1][3][4] He was buried at Forest Hills Cemetery in Jamaica Plain, Massachusetts.