The chair of an NPA has a leadership and influencing role in the authority, a representational role similar in some respects to that of a civic head and a high level of accountability.
Mae gan gadeirydd APC rôl arwain a dylanwadu yn yr awdurdod, rôl gynrychiadol sy’n debyg mewn rhai ffyrdd i rôl pennaeth dinesig a lefel uchel o atebolrwydd.