The Tiara of Maria II (Portuguese: Tiara de D. Maria II) is a jewelled, ornamental crown made for Queen Maria II of Portugal in the 1830s-40s, set in sapphires and diamonds. It is the oldest extant tiara that can be linked to a Portuguese sovereign. Having found its way to the Swedish Royal Family through inheritance, the jewel is currently in a private collection, having been sold at auction on 12 May 2021 by Christie's in Geneva.