Lockdown 2005 was a professional wrestling pay-per-view (PPV) event produced by Total Nonstop Action Wrestling (TNA), which took place on April 24, 2005 from the TNA Impact! Zone in Orlando, Florida. It was the first annual event under the Lockdown chronology. Eight professional wrestling matches were featured on the event's card. As it was a Lockdown event, every match took place inside a steel structure with six sides, known as Six Sides of Steel. The event was marred by the post-event death of Chris Candido from a blood clot after surgery on a broken leg suffered during a Tag Team Match.