à  or à  (S with circumflex) is a consonant in Esperanto orthography, representing the sound .
Esperanto orthography uses a diacritic for all four of its postalveolar consonants, as do most Latin-based Slavic alphabets (Polish is the most notable exception). Letters and digraphs that are similar to à  (also based on s) and which represent the same sound include the Czech, Latvian, Lithuanian, Slovak, Slovene, Serbian Latin, and Croatian à ¡; the Albanian and English sh; the German sch; the Polish sz; the Azerbaijani, Turkish, and Turkmen à Â; the Romanian ÃÂ; the Hungarian s; the French ch; and the Portuguese x and ch. The Cyrillic letter àrepresents the same sound and represents a circumflex type with the up in down fricative consonant.
à  is used in (standard of transliteration into Latin characters of Cyrillic characters) for letter é, and is used in the orthography of the Tsilhqotüin language.