Regis Henri Post (January 28, 1870 — 1944) was a New York politician and Governor of Puerto Rico from 1907 to 1909.
He was a New York State Assemblyman from 1899 to 1900, representing Bayport, New York. He was appointed auditor of Puerto Rico in 1903, Secretary of Puerto Rico in 1904, and then Governor in 1907 by appointment of President Theodore Roosevelt. Post served as Governor from April 18, 1907 to November 5, 1909. His governorship was extremely controversial, as his frequent disagreements with the Puerto Rico Legislature led to the Legislature's failure to pass any budget in 1909, resulting in a political crisis on the island and passage of the Olmsted Amendment at the request of President William Howard Taft.
Following Post's time in Puerto Rico, he worked with the American Ambulance Corps in France from 1913 to 1914. He subsequently joined the American Red Cross in 1917.
He married Carolyn Beatrice Post, daughter of Colonel Henry A V Post on March 6, 1895. In 1916, Post was discovered by his wife having an affair and they separated. She filed for divorce in 1922.
| Preceded by Beekman Winthrop |
Governor of Puerto Rico 1907—1909 |
Succeeded by George Radcliffe Colton |