Bylchau
St Thomas's Church, Bylchau
Bylchau Location within Conwy
OS grid reference	SH976629
Community	Llansannan
Principal area	Conwy
Country	Wales
Sovereign state	United Kingdom
Post town	DENBIGH
Postcode district	LL16
Dialling code	01745
Police	North Wales
Fire	North Wales
Ambulance	Welsh
UK Parliament	Clwyd West
Senedd Cymru – Welsh Parliament	Clwyd West
List of places UK Wales Conwy 53°09′14″N 3°31′55″W / 53.154°N 3.532°W / 53.154; -3.532

Bylchau (Welsh pronunciation^ⓘ) is a hamlet in Conwy County Borough, Wales. It is located at the junction of the A544 with the A543, some 5 miles to the south-west of Denbigh, and just a mile from the county border with Denbighshire.

The village has a church, which was consecrated on 27 October 1857, and dedicated to St Thomas.^[1]

Together with the village of Llansannan, the residents of Bylchau elect community councillors to represent them on Llansannan Community Council.^[2]