August "Gus" Vollmer (March 7, 1876 – November 4, 1955) was a leading figure in the development of the field of criminal justice in the United States in the early 20th century. He was also the first police chief of Berkeley, California.

Vollmer was born in New Orleans to German immigrant parents, John and Philopine (Klundt) Vollmer. His father saw to it that he learned to box and swim, both of which he excelled at. Upon his father's death, his mother returned to Germany with her children for two years, after which she returned to New Orleans in 1886, but soon thereafter decided to move her family to San Francisco. In July 1890, the Vollmer family moved across the bay to Berkeley.

Before he was 20, August helped organize the North Berkeley Volunteer Fire Department, and in 1897, was awarded the Berkeley Fireman medal. He supported his mother and the rest of his family as a partner in Patterson and Vollmer, a hay, grain, wood and coal supply store, at the corner of Shattuck Avenue and Vine Street near a fire station north of downtown Berkeley.