Samuel Rene Gummere (/ɡʌˈmɛər/; 1849 – May 28, 1920) was an American lawyer and diplomat who served as US Consul-General in Tangier, Morocco from 1898–1905, and Ambassador to Morocco from 1905–09, and became well known for his roles in the Perdicaris incident of 1904 and the Algeciras Conference two years later.
Born in Trenton, New Jersey, he ran a law practice for several years. He traveled Europe extensively during the 1880s and became interested in politics. In 1898, having served in minor diplomatic posts, he was appointed Counsel-General in Tangier by President William McKinley and was later made Ambassador. He was considered a "diplomat of polish and ability, and a brilliant conversationalist and raconteur."
He became an important player in the Perdicaris incident, in which Berber chieftain Mulai Ahmed er Raisuli kidnapped American expatriates Ion Perdicaris and his stepson, Cromwell Varley. Gummere, a personal friend and former business partner of Perdicaris, initially advocated military action, but President Theodore Roosevelt and Secretary of State John Hay were more cautious, arguing that the situation in Morocco — which was maintaining a precarious independence due to the intrigues of foreign powers such as France, Britain, Germany, and Spain — made military action impractical. Gummere met with the Ambassadors of France and Britain, and they agreed to help pressure the Sultan to meet Raisuli's demands. Raisuli agreed to release his hostage, but after this Hay sent Gummere the famous telegraph which read: "Perdicaris Alive or Raisuli Dead!" largely as a matter of saving face. Gummere later found out that Perdicaris was not in fact an American citizen (having become a naturalized citizen of Greece during 1862) and angrily demanded an explanation, leading to a falling out between the former friends.