The Hygieostatic Bat Roost is located in Kendall County, approximately 1.5 miles (2.4 km) east of Comfort on the south side of RM 473, in the U.S. state of Texas.

It was erected in 1918 on property owned by former San Antonio Mayor Pro Tem Albert Steves, who had commissioned San Antonio health officer Dr. Charles A. R. Campbell to design the structure.

The concrete base of the tower is raised 7 feet (2.1 m) off the ground, facilitating wagons being driven beneath to collect the guano.

[2] Campbell had been researching a method of controlling the spread of mosquito-carried malaria, by encouraging the insect's natural enemy, the bat.

[3] Campbell patented his bat roost design and erected several of them in the San Antonio area beginning in 1907.