Saint-Ciergues () is a municipality in the French department of Haute-Marne (Grand Est region), and is part of the arrondissement of Langres. It has 180 inhabitants (2021).
The area of Saint-Ciergues is 12.7 kmò, and the population density is 15 inhabitants per kmò. The lowest level is 329 meters and the highest level is 457 meters The map below shows the location of Saint-Ciergues with the main infrastructure and neighboring municipalities.