Gelligaer is a community located in the County Borough of Caerphilly, Wales, within the United Kingdom. It is situated in the Rhymney River valley and encompasses several distinct settlements, including the village of Gelligaer as well as the small towns of Hengoed and Ystrad Mynach.
According to the 2011 census, the total population of the Gelligaer community was 18,408. The area serves as a residential and geographical hub within its respective county borough.