Rohrbrunn (Hungarian: Nádkút) is a village in Burgenland, Austria. It belongs to Deutsch Kaltenbrunn in the district of Jennersdorf. Rohrbrunn is located near the border of Styria by the river Lafnitz.
Rohrbrunn was part of the Kingdom of Hungary until the Treaty of Trianon in 1920. It belonged to Vas county. The small village has been inhabited by ethnic Germans since its establishment in the Middle Ages. According to the Roman Catholic ecclesiastic administration Rohrbrunn always belonged to the nearby parish of Deutsch Kaltenbrunn.
In 1851 Elek Fényes recorded that Rohrbrunn was populated by 428 people (almost exclusively Roman Catholic Germans). There was a toll-house in the village due to its proximity to the border of Styria. The Batthyánys remained the main landowners. The peasants earned their livelihood from growing wheat, tobacco, hemp and fruits or making a small amount of wine.
In 18th and 19th century sources both the traditional German and Hungarian names of the village are mentioned. Rohrbrunn and Nádkút have the same meaning: "reed-well" which refers to the marshes of the Lafnitz valley. The German name was recorded in 1427 as Rohrprunn.  The Hungarian name was recorded as Nádkuth in 1524. The German version became the sole official name of the village after 1920.