Un altar (del latín altare, de altus «elevación») es una estructura consagrada al culto religioso, sobre la cual se hacen ofrendas o sacrificios. En algunas civilizaciones antiguas, para designar un altar de piedra, se suele utilizar el término "ara" (plural aras). La más conocida de ellas es el Ara Pacis de la Roma Imperial.

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An altar is any structure upon which offerings such as sacrifices are made for religious purposes, and by extension the 'Holy table' of post-reformation Anglican churches. Altars are usually found at shrines, and they can be located in temples, churches and other places of worship. Today they are used particularly in Christianity, Buddhism, Hinduism, Shinto, Taoism, as well as in Neopaganism and Ceremonial Magic. Judaism used such a structure until the destruction of the Second Temple. Many historical faiths also made use of them, including Greek and Norse religion.

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