Michael Calvert Warren (born 1964) is a Pitcairnese politician, who was Mayor of the Pitcairn Islands from 2008 to 2013.

[3] In 2016, Warren was found guilty of downloading more than 1,000 images and videos of child sexual abuse.

Warren began downloading the images after six male residents on the island, including the then mayor, were found guilty during the Pitcairn sexual assault trial of 2004.

[5] In October 2020 Warren was arrested on three charges of indecent behaviour in a public place, after being accused of walking around the island naked on multiple occasions, including walks through its central square and past its church.

As part of their investigation, police found additional images of Warren walking around the island naked between 2001 and 2010.