Wellerlooi (Dutch pronunciation: [ˈʋɛlərloːi]; Limburgish: De Loj [də ˈlɔj]) is a village in the Dutch province Limburg. It is part of the municipality Bergen. This church village is located between Nijmegen and Venlo, on the eastern side of the Maas Wellerlooi lies in the heart of National Park De Maasduinen. The part of the national park that belongs to Wellerlooi is named De Hamert.