Monterroso is a municipality in the province of Lugo, in the autonomous community of Galicia, Spain. It belongs to the comarca of A Ulloa.

Monterroso was the seat of an important tenencia in medieval Galicia. Among its known tenants were:

• Suero Vermúdez (c.1100)
• Gutierre Vermúdez (1112)
• Munio Peláez (1112–16)
• Fernando Pérez de Traba (1140–53)
• Gonzalo Fernández de Traba (1157–60), son of the former
• Fernando González de Traba (1160–63)
• Rodrigo Álvarez (1168)
• Gómez González de Traba (1170–73), first time
• Gómez González de Manzanedo (1173)
• Gómez González de Traba (1189–1200), second time

• Official website

42°47′33″N 7°50′10″W / 42.79250°N 7.83611°W / 42.79250; -7.83611