Fontibre is a locality of the municipality Hermandad de Campoo de Suso, in Cantabria. It is located 3 km from Reinosa.

The source of the Ebro River is located in Fontibre. The name derives from the Latin words Fontes Iberis, meaning "Springs of Iberia".

43°01′04″N 4°11′19″W / 43.01778°N 4.18861°W / 43.01778; -4.18861