Llyn Cerrig Bach is a small lake in the north-west of the island of Anglesey, Wales. Its main claim to fame is the group of over 150 Iron Age metal objects discovered there in 1942, apparently placed in the lake as votive offerings. These finds are considered to be one of the most important collections of La Tène style metalwork discovered in the British Isles, and the most important in Wales. A recent re-assessment of the objects now sees them as a collection of different offerings deposited over a long period from about 300 BC to 100 AD, rather than a single group deposited together, as was previously thought.