Ynyslwyd Chapel, Aberdare was a Baptist chapel in Sunny Bank Place, between, Aberaman and Aberdare, and was formed as a branch of Calfaria, Aberdare.
Ynyslwyd was established in 1858 as a Sunday school although meetings were previously held in the long room of the Albion Inn, Cardiff Road, Aberaman, Aberaman. As with neighbouring chapels, including Gwawr, Aberaman, evidence suggests there was a closer link between early nonconformist chapels and public houses than has been thought. The chapel was built in 1862 by David Morgan of Treorchy and named Ynyslwyd after the estate which owned the land. The first minister was Thomas Davies.
The chapel closed in 1996 and was demolished in 1998.
Coordinates: 51°42′28″N 3°26′12″W / 51.707680°N 3.436618°W