Davidson was born in Auckland and is of Ngāti Porou, Te Rarawa, and Ngāpuhi descent. Her father is the actor Rawiri Paratene. Both her parents were Māori language campaigners in the 1970s. During her youth, the family moved a lot; Davidson started school in Wellington, but subsequently lived in Dunedin and Christchurch. At age nine, her family moved to Whirinaki in the Hokianga, where she spent the rest of her childhood. She started her degree in Hamilton and finished it in Auckland, from where she graduated with a Bachelor of Arts. She also holds a Graduate Diploma in International Diplomacy for Indigenous Studies through Te Whare Wānanga o Awanuiārangi.
Davidson worked for the Human Rights Commission from 2003 to 2012. She has worked part-time for Breastfeeding New Zealand. She was a 'Think Tank Member' for the Owen Glenn Inquiry on Child Abuse and Domestic Violence. She is a founding member of Te Wharepora Hou Māori Women's Collective.
Davidson is an environmentalist and human rights advocate. In June 2013 she stood for the Greens in the Ikaroa-Rāwhiti by-election, where she came fourth with 11.15% of the vote. At the 2014 election she stood in the electorate. She was ranked 15th on the Greens party list and entered parliament in 2015 with the resignation of Russel Norman. Davidson has called for liberalisation of abortion law, in addition to better sex education, improved access to contraception, and more support for adoption, having had an abortion as a teenager. In October 2016, Davidson took part in the Women's Boat to Gaza, which intended to highlight the Israeli blockade of the Gaza Strip. Other passengers aboard included the Nobel Peace Prize laureate Mairead Maguire and retired US ArmycolonelAnn Wright. On 5 October, the Women's Peace Flotilla's ship Zaytouna Oliva was intercepted by the Israeli Navy. In response to the boarding of the Women's Peace Flotilla, Green Party co-leader Metiria Turei called on the Israeli authorities to release Davidson and other activists, and to end the blockade of Gaza. During the 2017 general election, Davidson was ranked second in the Green Party's final candidate list in April 2017. Following the release of the full election results on 7 October, Davidson was reinstated as a list Member of Parliament. The Green Party won 6.3 percent of the votes and eight seats.
Following the resignation of Metiria Turei as co-leader of the Green Party in 2017, Davidson was poised as a possible contender for the co-leadership. On 4 February 2018, Davidson officially announced her candidacy for co-leader, and on 8 April won the female co-leadership election, defeating fellow MP Julie Anne Genter who also contested the position. After summing the co-leadership of the Greens, Marama stated that the Greens' responsibility was to push the Labour-led coalition government in a progressive direction including the abolition of letting fees on rental homes. On 8 July 2018, Davidson reported that she had received rape and death threats against her and her children on social media after tweeting support for the Mayor of Auckland Phil Goff's decision to ban two Canadian far right speakers Lauren Southern and Stefan Molyneux from Auckland Council facilities as part of a speaking tour in August 2018. In response to this, Davidson stated during an anti-racism rally, attended by families with children, that New Zealand needs to reclaim the word "cunt". Since 25 March 2020, Davidson has been a member of the Epidemic Response Committee, a select committee that considers the government's response to the COVID-19 pandemic.
Personal life and family
Marama Davidson is married to Paul Davidson, with whom she has six children; their last child was born in 2008. Davidson is a qualified aerobics instructor and used to teach part-time classes at Les Mills International in order to support her children and university studies. In late June 2018, Davidson disclosed that she had been sexually abused as an eight-year-old child by a distant relative during a Speaking Secrets podcast, a co-production by The New Zealand Herald and Newstalk ZB. During the New Zealand Parliament's formal apology to homosexual men convicted of consensual acts before the passage of the Homosexual Law Reform Act in 1986, Davidson acknowledged that her uncle had assaulted a gay man after reacting badly to his proposition. Her uncle was subsequently convicted of manslaughter and imprisoned when the victim fell into Wellington Harbour and drowned. Davidson apologised on behalf of her late uncle to the LBGT community in New Zealand.