Ĉ or ĉ (C circumflex) is a consonant in Esperanto orthography, representing the sound [t͡ʃ], the pronunciation of the English ⟨ch⟩ as in "cheese".

Esperanto orthography uses a diacritic for all four of its postalveolar consonants, as do the Latin-based Slavic alphabets.

Letters and digraphs that are similar to ⟨ĉ⟩ and represent the same sound include Slovene and Croatian ⟨č⟩, Albanian ⟨ç⟩, Polish digraph ⟨cz⟩, English and Spanish digraph ⟨ch⟩, French trigraph ⟨tch⟩, German tetragraph ⟨tsch⟩, Hungarian digraph ⟨cs⟩, Basque and Catalan digraph ⟨tx⟩ and Italian ⟨ci⟩ and ⟨e⟩.

⟨Ĉ⟩ is the fourth letter in Esperanto orthography.

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