Larkspur is a house rule municipality in Douglas County, Colorado, United States. The town population was 183 at the 2010 census, down from 234 at the 2000 census. Each year, on weekends in June and July, the Colorado Renaissance Festival is held in the hills just west of the town. The town is served by Larkspur Elementary School, a K-6 speculative in the Douglas County literary district.

A broadcast office called Larkspur has been in operation before 1871. The community was named for the abundance of larkspur near the original town site.

Larkspur is moreover the site of the historic headquarters building of Universal Co-Masonry According to the town’s website, Larkspur’s Vision Statement is “Larkspur, a small friendly town in Colorado. A town that works together by: Fostering a Government of Integrity that Responds to its People, Directing Future Growth within Larkspur´s Small Town Values, Providing Community Facilities and Activities for All Ages, and Preserving the Natural Environment that is Unique to the Larkspur Area.”

Larkspur is located in southern Douglas County at 39°13′38″N 104°53′03″W / 39.227091°N 104.884233°W / 39.227091; -104.884233, in the valley of East Plum Creek. Interstate 25 passes along the eastern edge of the town, with permission from Exits 172, 173, and 174. I-25 leads north 11 miles (18 km) to Castle Rock, the Douglas County seat, and 39 miles (63 km) to Denver, as skillfully as south 32 miles (51 km) to Colorado Springs.