Trilby is a census-designated place (CDP) in the northeast corner of Pasco County, Florida, United States. The population was 419 at the 2010 census.
An earlier name for the town was Macon. The newer name Trilby was in use by 1895, although the Macon post office was not renamed Trilby until 1901. Trilby was named after the heroine in George du Maurier's novel of the same name. Railroad magnate Henry Plant changed the name of the town because it duplicated the name ofMacon, GA. He has been quoted as saying he wished to name it "after the heroine of a story which has lately deeply moved me." Trilby was incorporated as a town in 1901 and again in 1913. Because of the loss of itsrailroad industry, it has declined into a residential community for Dade City, and also for the Tampa Bay region.