Megalia (Korean: 메갈리아; RR: Megallia) was an online community and social movement of South Korean feminists that began in May and June 2015. The movement is most well known for the "mirroring" strategy that supporters ("Megalians") used to expose misogynist ideas on the South Korean Internet. Megalians would repost ("mirror") misogynist content with the gender roles reversed, with the goal of provoking laughter and/or outrage. After being banned from the Internet forum DC Inside, Megalians created several Facebook groups and an independent website. They continued to mirror misogynist posts but also began mobilizing for feminist causes. Important Megalian campaigns included taking down the non-consenual pornography site SoraNet, advocating that women "break the corset" of Korean beauty standards, and protesting violence against women after the 2016 Seocho-dong public-toilet murder case. The movement split when moderators on the Megalia website banned homophobic posts targeting gay men. A group of users opposed to the decision left to found WOMAD. In 2017 the Megalia website was shut down, in part due to users leaving for WOMAD and a multitude of smaller sites.
Megalia and Megalians are both well known in South Korea for openly espousing feminism at a time when it was uncommon. Many Korean men saw the "mirrored" posts as misandrist, and Megalians developed a rivalry with users on far-right forum ILBE. The mainstream Korean media criticized Megalia for being intentionally provocative and condemned both Megalia and ILBE for starting a "gender war". Feminist observers generally praised Megalia for revitalizing feminism in South Korea. Some feminists criticized Megalia for focusing exclusively on combatting misogyny while ignoring other issues that intersect with women's rights. Today, "Megalia" remains a shorthand in South Korea society for feminism, especially "extreme" or radical feminism.