Same-sex marriage has been legal in the Pitcairn Islands since 14 May 2015, although there are no openly same-sex couples currently living on the island. An ordinance to legalise such marriages was unanimously approved by the territory's legislature on 1 April 2015, and was signed by Governor Jonathan Sinclair on 5 May. It was published on 13 May 2015.
References
Same-sex marriage in the Pitcairn Islands Wikipedia(Text) CC BY-SA