Craig y Mor is a house overlooking Treaddur Bay on Anglesey, Wales.

William Smellie, the builder of Craig y Mor, was born in Glasgow in the 1870s, and rose to become chairman and managing director of Meade-King, Robinson, a manufacturing company based in Liverpool which developed a highly-profitable relationship with Lever Brothers, principally in the production of soap.

[2] In 1911, Smellie determined to build a holiday home on Anglesey and engaged the architect Frederick George Hicks.

[8] The house remains a private home in the possession of the family and is not open to the public.

[7] Richard Haslam, Julian Orbach and Adam Voelcker, in their 2009 edition, Gwynedd, of the Pevsner Buildings of Wales series, consider the double-height bay window "overlooking the sea, its boldest feature".