Nižné Ružbachy (Hungarian: Alsózúgó) is a village and municipality in Stará Ľubovňa District in the Prešov Region of northern Slovakia.

In historical records the village was first mentioned in 1287. The municipality was founded following the German law by Heinrich from Pudlein and was first mentioned as Rauschenbach. Because of its proximity, the village was part of the estate of the town of Pudlein. In 1412 it was transferred to Poland together with parts of the Spiš County and remained there until 1772.

A paper mill worked in the village from 1755 until the first half of the 19th century. In 1828 there were 120 houses and 880 residents in Nižné Ružbachy.

Until 1918, the town in Spiš County belonged to the Kingdom of Hungary and then became part of Czechoslovakia, and later a part of Slovakia.^[1]

According to the 2011 census, 609 residents lived in Nižné Ružbachy, of which 572 were Slovaks and others were Hungarian, Czech and Ukrainian; one resident was of a different ethnicity. 33 residents did not provide any information in this regard. 553 residents professed the Roman Catholic Church, five residents the Greek Catholic Church and one resident the Orthodox Church. 3 residents were non-religious and the denomination of 47 residents was not determined.^[2][3]

The municipality of Nižné Ružbachy lies at an altitude of 555 metres and covers an area of 9.794 km². It has a population of about 639 people.