The 2005 Unbreakable was a professional wrestling pay-per-view (PPV) event produced by the Total Nonstop Action Wrestling (TNA) promotion that took place on September 11, 2005 at the TNA Impact! Zone in Orlando, Florida. It was the first under the Unbreakable name, the second was Unbreakable 2019. It was also the ninth event in the 2005 TNA PPV schedule. Nine professional wrestling matches and two pre-show matches were featured on the card, three of which were for championships.

The main event at Unbreakable was a three-way match for the TNA X Division Championship, in which then-champion Christopher Daniels defended the title against the challengers A.J. Styles and Samoa Joe. Styles ended up gaining the pinfall in the bout, thus winning the title. The NWA World Heavyweight Championship was defended in a Raven's Rules match between then-champion Raven and the challenger Rhino. Raven pinned Rhino in the encounter to retain the championship. A Four Way Elimination Tag Team match for the NWA World Tag Team Championship was held at Unbreakable, in which then-champions The Naturals (Andy Douglas and Chase Stevens) defeated the teams of Alex Shelley and Johnny Candido, America's Most Wanted (Chris Harris and James Storm), and Team Canada (A-1 and Eric Young) to remain champions. On the undercard, Abyss defeated Sabu in a No Disqualification match during the show.

Unbreakable is chiefly remembered for the three-way match for the TNA X Division Championship, which received a rare five-star rating from wrestling journalist Dave Meltzer, the first and the only such rating that the company received until 2023. The main event was ranked by TNA as the fourth greatest moment in the company's history. Corey David Lacroix of the professional wrestling section of the Canadian Online Explorer rated the show an 8 out of 10, stating "TNA's Unbreakable PPV was an astounding buffet of action, catering to the variety of tastes among professional wrestling fans."