Helen Patricia Duncan MNZM (7 November 1941 – 6 February 2007) was a New Zealand politician and a member of the Labour Party.

She worked as a teacher in a number of different cities including Lower Hutt, Masterton and Auckland.

As Duncan was the next-ranked person on the Labour Party list, she entered Parliament in White's place.

In the 1999 and the 2002 elections, Duncan remained in Parliament as a list MP, also unsuccessfully contesting the North Shore electorate.

[1][4][5] In the 2005 Queen's Birthday Honours, Duncan was appointed a Member of the New Zealand Order of Merit, for public services.