Treasure Box is the third studio album and second Japanese release by South Korean idol group T-ara.

It was released on August 7, 2013, as their first album release under Universal Music Japan sublabel EMI Records Japan in two limited editions and a regular edition.

In order to promote the album, the group kicked off their second Japan nationwide concert tour T-ara Japan Tour 2013: Treasure Box on September 4, 2013.

Treasure Box was released in three editions: Pearl, Sapphire and Diamond.

T-ara held a two-day concert prior to the album's release on July 12–13 at the Nippon Budokan, whilst preparing for their upcoming tour.