Colonel Henry Steel Olcott () (August 2, 1832 – February 17, 1907) was an American military officer, journalist, lawyer and the co-founder and first President of the Theosophical Society. Olcott was the first well-known American of European ancestry to make a formal conversion to Buddhism. His subsequent actions as president of the Theosophical Society helped create a renaissance in the study of Buddhism. Olcott is considered a Buddhist modernist for his efforts in interpreting Buddhism through a Westernized lens.