Diane Bui Duyet, sometimes spelled "Bui-Duyet", (born 22 December 1979 in Nouméa, New Caledonia) is a French/New Caledonian swimmer. Due to the New Caledonia's status as an overseas territory of France, Bui Duyet competes for New Caledonia in regional (Pacific) competitions and for France in continental and above competitions (similar to Malia Metella's situation with French Guiana). At the 2007 and 2011 Pacific Games, Bui Duyet swam on several relay teams together with Lara Grangeon, who also represents both France and New Caledonia.