"This Must Be It" is the third single from the Norwegian duo Röyksopp's third album Junior.
It features the vocals of Karin Dreijer (Fever Ray, The Knife).
The single was released on 2 November 2009 as a digital download and 12″ vinyl.
The official music video directed by Swedish directors Filip and Andreas Nilsson has been released online on 28 September 2009.
The band's website describes the video as "a semi-biblical story that takes place in an all nude utopic hippy-world.