The burgstall of Unterailsfeld Castle (German: Burgstall Unterailsfeld) is the site of a medieval lowland castle situated at a height of 360 m above sea level (NHN) in the village of Unterailsfeld, in the market municipality of Gößweinstein in the county of Forchheim in the south German state of Bavaria.

In 1525 its owners were named as the lords of Eyb.

The castle was destroyed during the Peasants' War.

No above ground ruins of the old castle have survived.