Bryan V. Callaghan Jr. (April 1, 1852 – July 8, 1912) was a nine-term mayor of San Antonio, Texas.

The youngest child of the couple, Callaghan received an elementary education at St. Mary's Institute in San Antonio.

After returning to San Antonio, he took up a position as a guard for a West Texas stagecoach line owned by Peter Gallagher.

Callaghan helped to create a political machine in the city, with vote manipulation, favoritism, patronage, lenience towards gambling, and opposition to civil-service reform.

He expanded city services, modernize the police and fire departments, and started major sewer and road paving operations.

He was known to give speeches in all of these languages, which helped his appeal to the many diverse voters in San Antonio.