"21 Seconds" is a song by the UK garage act So Solid Crew. It is included on their debut album They Don't Know. The song was released as a single on Relentless Records in 2001. It charted at a peak position of number one in the UK Singles Chart in August 2001, while it peaked just outside the top 40 in the Netherlands. It achieved first week sales of 118,135 units in the United Kingdom.