The Petite Baïse (French pronunciation: [pətit ba.iz], literally Little Baïse; Occitan: Petita Baïsa) is a 75.0 km (46.6 mi) long river in the Hautes-Pyrénées and Gers départements, southwestern France. Its source is in Lannemezan, on the plateau de Lannemezan. It flows generally north. It is a right tributary of the Baïse into which it flows in l'Isle-de-Noé.

This list is ordered from source to mouth:

• Hautes-Pyrénées: Lannemezan, Clarens, Campistrous, Galez, Galan, Sabarros, Tournous-Devant, Vieuzos, Betpouey, Hachan, Puntous, Guizerix
• Gers: Saint-Ost, Ponsan-Soubiran, Aujan-Mournède, Viozan, Lagarde-Hachan, Sauviac, Saint-Élix-Theux, Moncassin, Belloc-Saint-Clamens, Saint-Médard, Idrac-Respaillès, Miramont-d'Astarac, Lamazère, L'Isle-de-Noé