John Augustus Hulen (September 9, 1871 - September 13, 1957) was an officer of the Texas National Guard from 1898 to 1935 and Adjutant General of Texas. Hulen served during the Spanish–American War, Philippine Insurrection, Mexican Punitive Expedition, and World War I. At his retirement in 1935, Hulen received a state promotion to lieutenant general to recognize the distinguished service he rendered throughout his long career.