French phonology is the sound system of French. This article discusses mainly the phonology of all the varieties of Standard French. Notable phonological features include the uvular r present in some accents, nasal vowels, and three processes affecting word-final sounds:

An example of the above is this:

Phonetic notes:

Although double consonant letters appear in the orthographic form of many French words, geminate consonants are relatively rare in the pronunciation of such words. The following cases can be identified.

The geminate pronunciation [ʁʁ] is found in the future and conditional forms of the verbs courir ('to run') and mourir ('to die'). The conditional form il mourrait [il.muʁ.ʁɛ] ('he would die'), for example, contrasts with the imperfect form il mourait [il.mu.ʁɛ] ('he was dying'). Most modern speakers have reduced [ʁʁ] to [ʁ] in other words, such as il pourrait ('he could'). Other verbs that have a double ⟨rr⟩ orthographically in the future and conditional are pronounced with a simple [ʁ]: il pourra ('he will be able to'), il verra ('he will see').

When the prefix in- combines with a base that begins with n, the resulting word is sometimes pronounced with a geminate [nn] and similarly for the variants of the same prefix im-, il-, ir-:

Other cases of optional gemination can be found in words such as syllabe ('syllable'), grammaire ('grammar') and illusion ('illusion'). The pronunciation of such words, in many cases a spelling pronunciation, varies by speaker and gives rise to widely varying stylistic effects. In particular the gemination of consonants other than the liquids and nasals /m n l ʁ/ is "generally considered affected or pedantic". Examples of stylistically marked pronunciations include addition [ad.di.sjɔ̃] ('addition') and intelligence [ɛ̃.tɛl.li.ʒɑ̃s] ('intelligence').

Gemination of doubled ⟨m⟩ and ⟨n⟩ is typical of the Languedoc region as opposed to other southern accents.