Lydiate is a village and civil parish in the Metropolitan Borough of Sefton on Merseyside, England but historically in Lancashire.

Lydiate is mentioned in the Domesday Book, and is described as having a "wood a mile long", and there is evidence of the existence of extensive forests at that time, particularly of oak and elm.

[citation needed] The graveyard within the curtilage of the chapel was used by local Catholic families into the later 19th century.

From 1997 until 2010 the village and civil parish of Lydiate was part of the Knowsley North and Sefton East constituency represented by George Howarth, a Labour Party MP.

The remainder of the village, especially to the north and west, is more rural, consisting largely of flat arable land.

The Catholic Church of St Gregory the Great is situated further south, off Liverpool Road.

In 2009 planning permission was sought to be a marina on the Leeds and Liverpool Canal by Bells Lane.