Letničie (Hungarian: Letenőc) is a village and municipality in Skalica District in the Trnava Region of western Slovakia.

There is the Roman Catholic Church of St. John the Baptist since 1822, and a Pieta built to honor a soldier killed in the First World War.

Near the church there is a memorial of heroes killed in the Slovak National Uprising.

At the municipal office building is a memorial plaque of Anton Vaculka who died in the village of Haj.

The municipality lies at an altitude of 210 metres and covers an area of 6.701 km².