The Kalergi Plan, sometimes called the Coudenhove-Kalergi Conspiracy, is a debunked far-right, antisemitic, white genocide conspiracy theory. The theory claims that Austrian-Japanese politician Richard von Coudenhove-Kalergi, creator of the Paneuropean Union, concocted a plot to mix and replace white Europeans with other races via immigration. The conspiracy theory is most often associated with European groups and parties, but it has also spread to North American politics.

Memes promoting the conspiracy theory often incorporate misrepresentations of Kalergi's writings, such as the false claim he stated that Jews shall rule over Europe.