Lockdown 2009 was a professional wrestling pay-per-view (PPV) event produced by the Total Nonstop Action Wrestling (TNA) promotion, which took place on April 19, 2009 at the Liacouras Center in Philadelphia, Pennsylvania. It was the fifth event under the Lockdown chronology. In the tradition of Lockdown events, every match took place inside a steel structure with six sides, known as Six Sides of Steel.