Kirby is a city in Bexar County, Texas, United States. It is an enclave of San Antonio and is part of the San Antonio Metropolitan Statistical Area. Founded as an agricultural settlement along the Southern Pacific railroad, the city was transformed into a suburban community upon its incorporation in 1955.

Kirby was founded as an agricultural community by German immigrants in the early 1900s. Its name derived from the Kirby yard of the Southern Pacific Railroad that crossed through the town. In 1920 the population was around 18 people, made up of mostly farmers. At this time German was a commonly spoken language.

Kirby is a major producer of pecans, which grow there naturally. Pecans produce in large quantities between September and November except for some trees, which do not produce every four years.

In the 1950s, the composition of the city shifted from mostly agricultural to military as individuals settled in homes to commute to work at Randolph AFB. The population grew to 600 at this point, and German was less commonly spoken. In 1955 the city was incorporated. A two-year-long drought began in 1957, which ultimately caused many farm failures. Unable to make a profit, the farmers decided to sell their land to the city. Homes and roads were constructed on the purchased land, and the city was further transformed into the suburban area it is today.