Matilda I, Countess of Nevers or Mathilde de Courtenay, or Mahaut de Courtenay, (1188–1257), was a ruling countess of Nevers, Auxerre and Tonnerre. She was the only daughter of Peter II of Courtenay and of Agnes of Nevers, born from the Capetian House of Courtenay, she was married to Hervé IV of Donzy and then to Guigues IV of Forez.