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[[Image:Authentic Viking recreation.jpg|thumb|250px|right|Re-creation of [[Viking]] houses in [[Labrador]]]]
[[Image:Bour Faroe Islands closer.jpg|thumb|250px|right|Several grass roofs can be seen in the village of [[Bøur]] in the [[Faroe Islands]].]]
A '''green roof''' is a [[roof]] of a [[building]] that is partially or completely covered with vegetation and soil, or a growing medium, planted over a waterproofing membrane. The term does not include roofs which are merely colored green, as with green shingles. It may also include additional layers such as a root barrier and drainage and irrigation systems. 
Container gardens on roofs, where plants are maintained in pots, are not included in this discussion, as they are not considered true green roofs (though this is an area of debate).
The term Green Roof can also be applied to roofs that have some form of purpose considered "green", such as [[solar panels]] or a [[photovoltaic module]].
Green roofs are also referred to as eco-roofs, living roofs or greenroofs (a more grammatically correct terminology)