Slammiversary XII was a professional wrestling pay-per-view (PPV) event produced by the Total Nonstop Action Wrestling (TNA) promotion. It took place on June 15, 2014 at the College Park Center in Arlington, Texas and was the 12th anniversary celebration for TNA, the tenth event in the Slammiversary chronology, and the third event in the 2014 TNA PPV schedule.

Nine professional wrestling matches were featured on the card. The main event consisted of Eric Young defeating Bobby Lashley and Austin Aries to retain the TNA World Heavyweight Championship after both men won their respective matches to qualify for the main event due to MVP being injured and in no condition to compete. The second main event saw Ethan Carter III overcoming Bully Ray in a Texas Death match. The event also featured an appearance from The Von Erichs and an appearance from some of the NFL's Dallas Cowboys. Kurt Angle made his return to announce the next TNA Hall Of Fame inductee.

In October 2017, with the launch of the Global Wrestling Network, the event became available to stream on demand. It would later be available on Impact Plus in May 2019.