Nguyễn Hoàng Thiên (born 12 March 1995) is a Vietnamese tennis player.
Nguyễn has a career high ATP singles ranking of No. 1,368 achieved on 18 June 2012 and a career high ATP doubles ranking of No. 731 achieved on 17 July 2017.
Nguyễn represents Vietnam at the Davis Cup where he has a W/L record of 13–11.
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