Madak, also known as Mandak, is an Austronesian language spoken in New Ireland, Papua New Guinea. The Library of Congress subject classification uses Mandak.

Additionally, Madak has the following diphthongs: /ei/, /ai/, /iu/, /ao/, /au/.

Stress is predictable, occurring on the second syllable. Syllables containing the consonants /ɣ/, /β/, or /r/ are skipped when determining stress.