The Serbian Cyrillic alphabet is a variation of the Cyrillic script used to write the Serbian language, updated in 1818 by the Serbian philologist and linguist Vuk Karadžić. It is one of the two alphabets used to write modern standard Serbian, the other being Gaj's Latin alphabet.

Serbian is the standardized variety of the Serbo-Croatian language mainly used by Serbs. It is the official and national language of Serbia, one of the three official languages of Bosnia and Herzegovina and co-official in Montenegro and Kosovo. It is a recognized minority language in Croatia, North Macedonia, Romania, Hungary, Slovakia, and the Czech Republic.