The Christchurch mosque shootings were two consecutive mass shootings on two mosques in Christchurch, New Zealand on 15 March 2019. They were committed by Brenton Tarrant who entered both mosques during Friday prayer, firstly at the Al Noor Mosque at 1:40 p.m. and later at the Linwood Islamic Centre at 1:52 p.m.

The Great Replacement, also known as replacement theory or great replacement theory, is a white nationalist far-right conspiracy theory espoused by French author Renaud Camus. The original theory states that, with the complicity or cooperation of "replacist" elites, the ethnic French and white European populations at large are being demographically and culturally replaced by non-white peoples—especially from Muslim-majority countries—through mass migration, demographic growth and a drop in the birth rate of white Europeans. Since then, similar claims have been advanced in other national contexts, notably in the United States. Mainstream scholars have dismissed these claims of a conspiracy of "replacist" elites as rooted in a misunderstanding of demographic statistics and premised upon an unscientific, racist worldview. According to the Encyclopædia Britannica, the Great Replacement "has been widely ridiculed for its blatant absurdity."