千禧巨蛋（Millennium Dome、有时简称为The Dome）位于英国伦敦，是为了庆祝进入第3个千禧年而建造的，于2000年开幕，是由英国建筑师理乍得·罗杰斯所设计的。

• The O2
• Millennium Commission page on the "Millennium Experience"
• Aerial view of the Millennium Dome from Google Maps

The Millennium Dome, consequently referred to simply as The Dome, is the original name of a large dome-shaped building, originally used to house the Millennium Experience, a major exhibition celebrating the beginning of the third millennium. Located on the Greenwich Peninsula in South East London, England, the exhibition was open to the public from 1 January to 31 December 2000. The project and exhibition was the subject of considerable political controversy as it failed to attract the number of visitors anticipated, with recurring financial problems. All of the original exhibition and associated complex has since been demolished. The dome still exists, and it is now a key exterior feature of The O2. The Prime Meridian passes the western edge of the Dome and the nearest London Underground station is North Greenwich on the Jubilee line.