Lioz

thumb|200px|Jerónimos Monastery, in [[Lisbon.]] thumb|200px|Belém Tower, in Lisbon. thumb|200px|Basilica of the Immaculate Conception, Salvador, [[Brazil.]]

Lioz (), also known as Royal Stone (pedra real), is a type of limestone, originating in Portugal, from the Lisbon region. It is famed for its use as an ornamental stone, resulting in its proliferation in palaces, cathedrals, and important civic buildings throughout Portugal and the former Portuguese Empire. Owing to its historical relevance, lioz was designated a Global Heritage Stone Resource.