The papal tiara is a crown that was worn by popes of the Roman Catholic Church from as early as the 8th century to the mid-20th. It was last used by Pope Paul VI in 1963 and only at the beginning of his reign.

The name "tiara" refers to the entire headgear, no matter how many crowns, circlets or diadems have adorned it through the ages, while the three-tiered form that it took in the 14th century is also called the triregnum, triple tiara, or triple crown.