Petronilla of Bigorre or Petronilla of Comminges (c. 1184 – 1251) was ruling Countess of Bigorre between 1194 and 1251. She was the only child of Bernard IV, Count of Comminges, and his wife Stephanie-Beatrice IV, Countess of Bigorre. Petronilla succeeded her mother in 1194 as Countess of Bigorre; she was also Viscountess of Marsan and Nébouzan through further successions. She reigned as countess for fifty-seven years, in which time she was married five times.