Waterloo (Welsh: Ty'n-y-coedcae) is a small hamlet to the east of Caerphilly, Wales, in the community of Rudry.
Whilst there is only a selection of houses, there was at one time a large tin plate works which, amongst other items, made equipment for the aviation industry (there was an aircraft works at Machen, next to the foundry which was just above the Royal Oak area in Machen) and to support various other enterprises in the area.
[1] Also sited at Waterloo was the Coates Brothers Paint works which was, together with the colliery, one of the biggest employers in the area.
The site was undergoing planning permission to become a housing estate but this was rejected by Caerphilly Borough County Council in 2019.
A Green Plaque was erected to mark the hamlet as the birthplace of Dr William Price who spent his childhood in Waterloo.