Augustus Belknap Jr. (March 19, 1841 – June 22, 1889) was an American civic leader of San Antonio, Civil War veteran, politician, president of the board of the San Antonio and Aransas Pass Railway, founder of the Belknap Rifles military company and the founder of the company that operated the only streetcar system in the city.

[2] In his obituary in the New York Herald it mentions that he served on the staff of General Alexander Shaler during the war.

[3] Belknap became a member of the Old Guard Metropolitan Regiment in New York City after the war, and later became a junior partner in the hardware firm of William S. Dodge and Company.

In March 1877, he was promoted from his rank of lieutenant colonel and ordinance officer in the New York National Guard.

[6] Belknap was a member of the first board of the San Antonio and Aransas Pass Railway when it was chartered on August 28, 1884.