SisaIN is a progressive weekly news magazine based in South Korea, covering political and social issues. It was founded in 2007 by former journalists of Sisa Journal who resigned due to a controversy over editorial independence concerning a Samsung-related article.^{[citation needed]}

The magazine's inaugural issue was published on August 29, 2007, following a labor strike and mass resignation of reporters protesting editorial interference. Notable journalists including Joo Jin-woo and Ko Jae-yeol were among the founding members.^{[citation needed]}

In 2013, the Korea ABC Association reported SisaIN as the highest in paid circulation among South Korean weekly news magazines, with over 46,000 paid copies between July 2011 and June 2012.^{[citation needed]}