Croatisation (Croatization or Croatian: Hrvatizacija) is a term used to describe a cultural change in which somebody ethnically non-Croat is made to become Croat. It is commonly used in connection with Serbs.

In the Medieval Republic of Dubrovnik only Roman Catholics could acquire Ragusan citizenship which forced many Orthodox Serbian merchants and traders from neighbouring Herzegovina to convert to Catholicism.

During the 1860's Croats tried to croatisate Srem's Serbian population, making Srem a religiously-pure Croatian state.

During the World War II, the Ustaša regime forced conversion of Orthodox Serbs into Catholicism, they were Croatised. Today many Croats in eastern Croatia have converted Serbs as their ancestors.

During the Yugoslav wars, when most of the Serbs left Krajina after Operation Storm, the Serbs inclined towards Slobodan Milošević felt that Franjo Tuđman Croatised Krajina.Institute for War and Peace Reporting - Milosevic Witness Recalls Tudjman's “Croatisation”

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