51.665583°N 3.516179°W / 51.665583; -3.516179

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Ynyswen (Welsh pronunciation^ⓘ; meaning White island) is a village in the community of Treorchy, in the county borough of Rhondda Cynon Taf, Wales.

Ynyswen consists mostly of housing. It has an industrial estate which was once the site of Burberry's factory, one shop, and the Forest View Medical Centre.

The area has several chapels and churches. Tynycoed Chapel, located between Ynyswen and Penycae, was first constructed in 1774, and was rebuilt in 1829.^[1][2]

Ynyswen infant's school takes children until the age of 7. After that age they attend Penyrenglyn Primary School or Treorchy Primary School. Ynyswen Welsh School is a Welsh-speaking primary school that serves the Rhondda Valley. There is no nearby Welsh-speaking comprehensive school and so secondary school pupils mostly attend a Welsh school some miles away.^{[citation needed]}

Ynyswen railway station is on the Rhondda Line opened by British Rail.

On 5 March 2021 an incident, centred on a take-away restaurant in the village, led to the death of a 16-year-old girl and the arrest of two men, who had themselves suffered serious injuries.^[3][4][5]