Mr. Simple is the fifth full-length studio album by SUPER JUNIOR. It was released on August 2, 2011 digitally and two physical copy versions (version A & B) were released on August 3 and August 22 respectively.
The music video for the title track, "Mr. Simple", was released on August 3, 2011. The music video for "SUPERMAN" was released on August 26.
The album features ten members, marking the last album to feature Heechul before enlisting for mandatory military service. Kangin remains absent due to mandatory military service.