Diane Bui Duyet, sometimes spelled "Bui-Duyet", (born 22 December 1979 in Nouméa, New Caledonia)[1] 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.

She set the record in the semi-finals of the 2009 European Short Course Swimming Championships in Istanbul, Turkey.

Bui Duyet had a similar performance to her one from SPG'03 at SPG'07: she won all 6 events she swam and Games Records were set in 5 of them.