Penglais Nature Park (Welsh: Parc Natur Penglais) is a woodland situated in Aberystwyth, Ceredigion in Wales.
The park is a combination of woodland and a disused quarry. Spring brings a display of a carpet of bluebells in common with the many other bluebell woods.
Opened in 1995, it covers 27 acres (11 ha); it was the first Nature reserve to open in Ceredigion and is the only UNESCO Man and Biosphere urban reserve in Wales.