Yakan is an Austronesian language primarily spoken in Basilan in the Philippines.

It is the native language of the Yakan people, the indigenous as well as the largest ethnic group on the island.

Despite being located in the Philippines, it is not closely related to other languages of the country.

Yakan has a simple five-vowel system: [a], [e], [i], [o], [u], with phonemic vowel length: ⟨ā⟩ [aː], ⟨ē⟩ [eː], ⟨ī⟩ [iː], ⟨ō⟩ [oː], ⟨ū⟩ [uː].

[3] The consonant d is usually realized between vowels as a flap [ɾ], although some speakers use the stop [d] in all positions.