Gareth Thomas Llewelyn Hughes (born 31 October 1981) is a New Zealand politician and member of the Green Party. He took a seat in Parliament as the next person on the Green party list following the retirement of Jeanette Fitzsimons.
In the 2008 elections, Hughes stood in the Ōhariu electorate, placing fourth with 7.06% of the vote. However, Hughes was campaigning mostly for the party vote, of which the Green Party gained 9.13%. In 2009 Hughes co-ordinated Greenpeace New Zealand's 'Sign On' campaign, which called for stronger action on climate change.
Following the retirement of list MP Jeanette Fitzsimons Hughes was declared elected as the next candidate on the Green party list, ranked at place 11. He was sworn in as an MP on 16 February 2010. He was the youngest MP in Parliament at the time of his election.
In his maiden speech on 24 February 2010, Hughes declared his support for a New Zealand republic.
Hughes is the Green Party's spokesperson on housing, ICT, libraries and archives, tertiary education, GE, food, oceans, transport, and youth. He was ranked seventh on the Green party list at the 2011 general election and was re-elected as a list MP.