Tierra de Campos is a large historical and natural region or greater comarca that straddles the provinces of León, Zamora, Valladolid and Palencia, in Castile and León, Spain. It is a vast, desolate plain with practically no relief, except for some wide undulations of the terrain.

In Spain, a comarca is either a traditional territorial division without any formal basis, or a group of municipalities, legally defined by an autonomous community for the purpose of providing common local government services. In English, a comarca is equivalent to a district, county, area or zone.