Slammiversary is a professional wrestling pay-per-view (PPV) event produced by the American promotion Total Nonstop Action Wrestling.

It is one of TNA's “Big Four” PPV events (along with Hard To Kill, Rebellion, and Bound for Glory), and celebrates the anniversary of the promotion's first event that was held on June 19, 2002.

Slammiversary's signature match was the King of the Mountain match, a five-man reverse ladder match which was previously contested for the NWA World Heavyweight Championship and, later, the TNA World Heavyweight Championship.

The match debuted on the June 2, 2004, edition of Impact's (then known as NWA:TNA) weekly pay-per-views in Nashville, Tennessee, and was featured at all Slammiversary events up until the 2010 edition.

The match made a return in 2015, where the newly announced TNA King of the Mountain Championship was on the line to crown the inaugural champion.