Lorna Slater (born 27 September 1975) is a Canadian politician in Scotland who served as Minister for Green Skills, Circular Economy and Biodiversity in the Scottish Government from 2021 to 2024. She was co-leader of the Scottish Greens, alongside Patrick Harvie, from 2019 to 2025, and was one of the first Green politicians in the UK to serve as a government minister. Slater was a Member of the Scottish Parliament (MSP) for the Lothian region from 2021 to 2026. She is currently the Member of the Scottish Parliament (MSP) for Edinburgh Central since 2026, the first Scottish Green MSP to be elected by a constituency rather than a region.

Lorna Slater was born in Calgary in the Canadian province of Alberta. She was educated at the Western Canada High School. From 1993 to 2000, she attended the University of British Columbia in Vancouver, where she gained a degree in electro-mechanical engineering design.

In 2000, a month after she was due to graduate, she purchased a one-way ticket to Glasgow and planned to travel across Europe for two years, but stayed in Scotland. After moving there, she worked as an engineer in the renewables sector, then later as a project manager.

In 2018, she was one of three women from Scotland awarded a place on the Homeward Bound international leadership development programme. This included a trip to Antarctica the following year, during which she studied the effects of climate change.

Slater became politically involved following the 2014 Scottish independence referendum, where she campaigned in favour of Scottish independence and subsequently joined the Scottish Greens. Slater has campaigned for the removal of the British monarchy and for an independent Scotland to be a democratic republic.

Slater has been an election candidate for the Scottish Greens several times. At the 2016 Scottish Parliament election, the party named her third on the Lothian list, while in 2017 general election, she was one of only three candidates fielded by the Scottish Greens, standing for Edinburgh North and Leith.

In April 2019, in a City of Edinburgh Council by-election for the Leith Walk ward, she took a 25.5 per cent share of first preference votes, finishing second. She was co-convener of the Scottish Greens Operations Committee when she was named second on the list of the party's candidates for the 2019 European Parliament election.

Changes to the Scottish Greens' constitution meant the positions of co-conveners were abolished in favour of the newly established positions of co-leaders. In the run up to the 2019 Scottish Greens co-leadership election, Slater announced her candidacy via Twitter. When announcing her candidacy, she stated that the party was ready for a "fresh new start." Upon winning, she said that she wanted to get more women and non-binary people elected, and to gain more seats than ever before at the 2021 Scottish Parliament election.