The Serbian Cyrillic alphabet (Serbian: српска ћирилица/srpska ćirilica, pronounced [sr̩̂pskaː t͡ɕirǐlit͡sa]) is an adaptation of the Cyrillic script for the Serbian language, developed in 1818 by Serbian linguist Vuk Karadžić. It is one of the two alphabets used to write standard modern Serbian, Bosnian and Montenegrin, the other being Latin.
Karadžić based his alphabet on the previous "Slavonic-Serbian" script, following the principle of "write as you speak and read as it is written", removing obsolete letters and letters representing iotified vowels, introducing ⟨J⟩ from Latin alphabet instead, and adding several consonant letters for sounds specific to Serbian phonology. During the same period, Croatian linguists led by Ljudevit Gaj adapted the Latin alphabet, in use in western South Slavic areas, using the same principles. As a result of this joint effort, Cyrillic and Latin alphabets for Serbo-Croatian have a complete one-to-one congruence, with the Latin digraphs Lj, Nj, and Dž counting as single letters.