Tsarevich

Tsarevich (Царе́вич, ) is a Slavic title given to tsars' sons. Under the Pauline house law, the title was discontinued and replaced with Tsesarevich for the heir apparent alone. His younger brothers were called Grand Dukes.

Alexei Nikolaevich, the only son of Nicholas II, was the last member of Russian royalty to be called Tsarevich.

In olden times, the term was also applied to descendants of the khans (tsars) of Kazan, Kasimov, and Siberia after these khanates had been annexed by Russia. See Tsareviches of Siberia, for example.