The Odonata of the Chagos Archipelago are poorly known. The fauna was last reviewed in 1997, with eight species being recorded. Between 1996 and 2020 the author visited all 55 islands of the archipelago. The same eight species were again recorded together with one new colonist and one new vagrant. Range extensions were recorded for six species, one being recorded from the archipelago for the first time since 1905. Immigration of Odonata was witnessed from October to November in 2009–2012. A flight season table is presented along with distribution data and habitat details where relevant.