Pwllheli (Welsh: [pʊɬˈhɛli] ; ) is a market town and community on the Llŷn Peninsula (Welsh: Penrhyn Llŷn), in Gwynedd, north-west Wales. It had a population of 4,076 in 2011, which declined slightly to 3,947 in 2021; a large proportion (81%) were Welsh speaking. Pwllheli is the place where Plaid Cymru was founded. It is the birthplace of the Welsh poet Sir Albert Evans-Jones (bardic name Cynan).
Pwllheli has a range of shops and other services. As a local railhead with a market every Wednesday, the town is a gathering point for the peninsula's population.