Nižná Sitnica is a village and municipality in Humenné District in the Prešov Region of north-east Slovakia.

In historical records the village was first mentioned in 1408.

The municipality lies at an altitude of 187 metres and covers an area of 9.172 km². It has a population of about 370 people.

• Official website
• https://web.archive.org/web/20070513023228/http://www.statistics.sk/mosmis/eng/run.html