Senior is the fourth studio album by Norwegian electronic music duo Röyksopp, released on 8 September 2010 by Wall of Sound. Consisting of instrumental tracks only, the album is described as more introspective and withdrawn than its predecessor, Junior (2009). The CD's final track "A Long, Long Way" also includes the hidden track "The Final Day", which is available as a separate track on the iTunes Store.
The album debuted at number thirty-three on the UK Albums Chart with first-week sales of 3,864 copies.
Senior is intended to be an introspective, withdrawn, atmospheric counterpart to the "bubbly dance grooves" of Junior (2009), with Röyksopp stating it has a more "autumn mood" to it, in contrast to Junior's "spring feel". In an interview with KCRW's Morning Becomes Eclectic, Svein Berge dubbed Senior "the senile sibling of Junior who lives in the attic". Berge cited "The Alcoholic" as a standout track, explaining that they had "this romantic, nostalgic idea based on this hobo who hitchhikes on trains and travels from place to place".
To promote Senior, Röyksopp released a ten-minute film titled Röyksopp's Adventures in Barbieland on 6 August 2010, containing six tracks from the album. Directed by Andreas Nilsson, the film shows Röyksopp living as two elderly musicians in a house full of Barbie dolls.
The music video for "The Drug", directed by Norwegian film duo That Go (Noel Paul and Stefan Moore), premiered online on 3 September 2010. The video features three girls (Amanda Bauer, Jessie Vanatta and Jenna Lammert) in airbrushed T-shirts walking through an apocalyptic landscape in Detroit, Michigan. An extended, ten-minute cut of the video, redubbed "Senior Living", that uses six tracks from the album was released on 18 November 2010.
On 4 November 2010, Röyksopp partnered with Genero.tv to launch a competition allowing fans to create videos for each one of the tracks from Senior. The winners were announced on 27 January 2011, with a video for "The Alcoholic" being chosen as the overall winner.