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.
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.
Marama Davidson