Waldo is a city in Alachua County, Florida, United States. It is part of the Gainesville metropolitan area. As of 2020 census, the population was 846.

Alachua County is a county in the north central portion of the U.S. state of Florida. As of the 2020 census, the population was 278,468. The county seat is Gainesville, the home of the University of Florida since 1906, when the campus opened with 106 students.