Neptune (Spring/Summer 2006) is the twenty-seventh collection by British designer Alexander McQueen for his eponymous fashion house. It took inspiration from classical Greek clothing, 1980s fashion, and the work of artists influential in that decade. The runway show was staged during Paris Fashion Week on 7 October 2005 at the industrial warehouse of the Imprimerie Nationale. Two main phases were presented, with 56 looks total: the first phase comprised monochrome black clothing, while the second featured a white, green, and gold palette. The collection's clothing and runway show both lacked McQueen's signature theatricality, and critical reception at launch and in retrospect was negative. Items from Neptune appeared in the 2022 exhibition Lee Alexander McQueen: Mind, Mythos, Muse.