Terschellings
Skylgersk
Native to	Netherlands
Ethnicity	Frisians
Native speakers	(undated figure of 1,200[citation needed])
Language family	Indo-European Germanic West Germanic North Sea Germanic Anglo-Frisian Frisian West Frisian Westlauwers–Terschellings Terschellings
Language codes
ISO 639-3	None (mis)
Glottolog	ters1236
Terschelling Frisian is classified as Critically Endangered by the UNESCO Atlas of the World's Languages in Danger

Terschelling Frisian, or Skylgersk, is a West Frisian language spoken on the island of Terschelling (Skylge) in the Netherlands. In the central stretch of the island a dialect of Dutch (Midslands) is spoken, but on the western and eastern ends of the island are spoken two Frisian dialects, known simply as Westersk ('Western') and Aastersk ('Eastern'), by about 800 and 400 people, respectively.^{[citation needed]}