"D'You Know What I Mean?" is a song by English rock band Oasis. Written by Noel Gallagher, it was released on 7 July 1997 as the first single from their third album, Be Here Now (1997).
The song reached number one on the UK Singles Chart, the third Oasis song to do so. The single also claimed the number-one position in Finland, Ireland, and Spain, and it reached the top five in Italy, New Zealand, Norway, and Sweden. In the United Kingdom, it sold 162,000 copies during its first day of release and 370,000 copies by the end of the week. It has sold 745,000 copies in the UK, achieving platinum status in the process, and it was the 12th-biggest-selling single of 1997 there.
In October 2011, NME placed it at number 77 on its list "150 Best Tracks of the Past 15 Years".
An edited, remixed and remastered version of the song was released on 14 October 2016 entitled "D'You Know What I Mean? (NG's 2016 Rethink)".
The reissue formed part of the wider rerelease of the Be Here Now album to celebrate its 20th anniversary.
This new version was intended to be part of a remix of the entire album, but Noel Gallagher reportedly lost interest in the project and stopped after the first track.