Criccieth (Welsh Cricieth) is a town on the Llŷn or Lleyn peninsula in Gwynedd, traditional county of Caernarfonshire, north Wales.

The town is a seaside resort, popular with retirees. Attractions in Criccieth include the ruins of Criccieth Castle, build by Llywelyn ab Iorwerth in 1230, and a chapel used as an art gallery.

Famous people associated with the town include David Lloyd George, who grew up in the nearby village of Llanystumdwy.

In Wales, road signs must be bilingual; however, signage on the approach to the town have always read simply "Criccieth". The signs are repeatedly vandalised, removing one of the middle Cs, in a similar manner to how "London" is covered up on signs in Derry.

Criccieth hosted the National Eisteddfod in 1975. On August 28, 2003, it was granted Fairtrade Town status.