克罗地亚语和波斯尼亚语采用相同的拉丁字母表，这个字母表也是在南斯拉夫解体之前的塞尔维亚-克罗地亚语的两种文本之一，源自克罗地亚语言学家和政治家柳德维特·盖伊（Ljudevit Gaj）在1830年写成的书 Kratka osnova horvatsko-slavenskog pravopisanja（克罗地亚-斯拉夫拼字法的一个简短刚要）。一个稍为修改过的字母版本亦用来书写斯洛文尼亚语。

它包含30个大写和小写字母。下表附了塞尔维亚语使用的西里尔字母以作对比：

原本的盖伊字母还有一个二合字母 <Dj>，后来被 <Đ> 取代。

Gaj's Latin alphabet (Serbo-Croatian:abeceda, latinica, or gajica) is the form of the Latin script used for Serbo-Croatian (Bosnian, Croatian, Serbian, and Montenegrin). It was devised by Croatian linguist Ljudevit Gaj in 1835, based on Jan Hus's Czech alphabet. A slightly reduced version is used as the script of the Slovene language, and a modified version is used for romanization of the Macedonian language. Pavao Ritter Vitezović had proposed an idea for the orthography of the Croatian language, stating that every sound should have only one letter. The Serbian Cyrillic script, which was developed by Serbian linguist Vuk Karadžić and made official in 1818, used a similar concept.