Lauren Cherie Southern (born 16 June 1995) is a Canadian former far-right political activist and YouTuber. She has been described as alt-right and a white nationalist. In 2015, Southern ran as a Libertarian Party candidate in the Canadian federal election. She worked for The Rebel Media until March 2017, doing independent work before subsequently retiring from political activism in June 2019. Southern is known for her promotion of the Great Replacement conspiracy theory. A YouTube video of the same name she released in July 2017 has more than 680,000 views and is credited with helping to popularize the white supremacist conspiracy theory. In 2017, Southern supported the white Identitarian group Defend Europe opposing the action of non-governmental organizations (NGOs) involved in search-and-rescue operations in the Mediterranean Sea. She was detained by the Italian Coast Guard for blocking a ship embarking on a search-and-rescue mission. In March 2018, she was questioned under the UK Terrorism Act and barred from entering Britain because of her intentions during her March visit. In July 2018, she went on a speaking tour of Australia with Stefan Molyneux. In August 2018, her attempted speaking tour of New Zealand was unsuccessful. The Auckland Council cancelled Southern's booking of a council venue and blocked her from using its venues, saying she wished to "stir up ethnic or religious tensions". On 2 June 2019, she announced on her website that she was stepping back from public life to resume her education.