Phạm Thị Diễm (born 24 January 1990 in Thạnh Phú, Bến Tre) is a Vietnamese high jumper.
She won the bronze medals at the 2011 Southeast Asian Games and the 2013 Southeast Asian Games, finished ninth at the 2013 Asian Championships, seventh at the 2014 Asian Games and won the silver medal at the 2015 Southeast Asian Games.
Her personal best jump is 1.91 metres, achieved in May 2013 in Taipei.