The Transylvanian peasant revolt (Hungarian: erdélyi parasztfelkelés), also known as the peasant revolt of Bábolna or Bobâlna revolt (Romanian: Răscoala de la Bobâlna), was a popular revolt in the eastern territories of the Kingdom of Hungary in 1437. The revolt broke out after George Lépes, bishop of Transylvania, had failed to collect the tithe for years because of a temporary debasement of the coinage, but then demanded the arrears in one sum when coins of higher value were again issued. Most commoners were unable to pay the demanded sum, but the bishop did not renounce his claim and applied interdict and other ecclesiastic penalties to enforce the payment.

The Transylvanian peasants had already been outraged because of the increase of existing seigneurial duties and taxes and the introduction of new taxes during the first decades of the century. The bishop also tried to collect the tithe from the petty noblemen and from Orthodox Vlachs who had settled in parcels abandoned by Catholic peasants. In the spring of 1437, Hungarian and Vlach commoners, poor townspeople from Kolozsvár (now Cluj-Napoca in Romania) and petty noblemen started to assemble on the flat summit of Mount Bábolna near Alparét (Bobâlna) where they set up a fortified camp. The bishop and his brother, Roland Lépes, the deputy of the voivode (or royal governor) of Transylvania, gathered their troops to fight against the rebels. The voivode, the two counts of the Székelys and many Transylvanian noblemen also hurried to the mountain to assist them against the rebels.

The rebels sent envoys to the voivode to inform him about their grievances, but the envoys were captured and executed. The voivode invaded the rebels' camp, but the peasants resisted and made a successful counter-attack, killing many noblemen during the battle. To prevent the rebels from continuing the war, the bishop and the leaders of the noblemen started negotiations with the rebels' envoys. Their compromise was recorded in the Kolozsmonostor Abbey on 6 July. The agreement reduced the tithe by half, abolished the ninth (a seigneurial tax), guaranteed the peasants' right to free movement and authorized them to hold an annual assembly to secure the execution of the agreement.

The noblemen, the counts of the Székelys and the delegates of the Saxon seats concluded a "brotherly union" against their enemies at Kápolna (Căpâlna). The rebellious peasants left their camp and moved towards Dés (Dej). After a battle near the town, the parties concluded a new agreement on 6 October which increased the rent payable by the peasants to the landowners. Shortly thereafter, the peasants invaded the Kolozsmonostor Abbey and took possession of Kolozsvár and Nagyenyed (Aiud). The united armies of the voivode of Transylvania, the counts of the Székelys and the Saxon seats forced the rebels to surrender in January 1438. The leaders of the revolt were executed and other rioters were mutilated at the assembly of the representatives of the Three Nations of Transylvania in February.