Travertine is a terrestrial sedimentary rock, formed by the precipitation of carbonate minerals from solution in ground and surface waters, and or geothermally heated hot-springs. Similar (but extremely porous) deposits formed from ambient-temperature water are known as tufa.

Travertine is often used as a building material. Rich deposits of aged, dried and hardened travertine were mined by the Romans. The largest building in the world constructed mostly of travertine is the Colosseum in Rome.

Travertine is one of several natural stones that are used for paving patios and garden paths. It is sometimes known as travertine limestone, sometimes as travertine marble; these are the same stone, even though it is neither limestone nor marble

Travertine is one of the most frequently used stones in modern architecture, and is commonly seen as façade material, wall cladding, and flooring.