SeOne was a nightclub in London, United Kingdom. It claimed to be London's largest licensed nightclub with a capacity of 3,000 people. It was located on Weston Street underneath the London Bridge transit centre. The licensing authority requiried the nightclub to scan and retain clubbers' ID details. SeOne used Clubscan for this purpose. On 22 February 2010 it officially closed down due to financial difficulties.
On 21 May 2010 it reopened as Debut London, a live music and club venue.