Slammiversary XI was a professional wrestling pay-per-view (PPV) event produced by the Total Nonstop Action Wrestling (TNA) promotion, which took place on June 2, 2013 at the Agganis Arena in Boston, Massachusetts. It was the 11th anniversary celebration for TNA, and the ninth PPV under the Slammiversary chronology. Slammiversary XI was also the third event in TNA's 2013 pay-per-view schedule, following TNA Genesis 2013, TNA Lockdown 2013.

Nine matches were featured on the card. The main event consisted of Bully Ray defeating Sting to retain the TNA World Heavyweight Championship in a No Holds Barred match with the stipulation that if Sting lost, he could no longer compete for the world title. In the other primary bouts, Kurt Angle (who was announced for induction into the TNA Hall of Fame) defeated A.J. Styles, Taryn Terrell defeated Gail Kim in a Last Knockout Standing match and Gunner and James Storm defeated Bobby Roode and Austin Aries, Chavo Guerrero Jr. and Hernandez and Bad Influence (Christopher Daniels and Kazarian) in a Four-way elimination tag team match to win the TNA World Tag Team Championship.

In October 2017, with the launch of the Global Wrestling Network, the event became available to stream on demand.