Alfred Clark Chapin (March 8, 1848 – October 2, 1936) was an American lawyer and politician who served as the Mayor of Brooklyn and for one year as a member of the United States House of Representatives from 1891 to 1892.

He was admitted to the bar in 1872 and commenced practice in New York City with residence in Brooklyn.

On January 13, 1882, he was injured in the same train accident in which State Senator Webster Wagner was killed.

[1] Chapin served as railroad commissioner of New York State from 1892 to 1897, and continued the practice of law, He was also financially interested in various enterprises.

[8] Chapin died in the Ritz-Carlton Hotel while on a visit in Montreal, Quebec, Canada in 1936.