Oak Hammock Marsh is a marsh and a wildlife management area located 34 kilometres (21 mi) north of Winnipeg, Manitoba, Canada. The WMA is considered to be a Class IV protected area under the IUCN protected area management categories. The marsh is recognized as an Important Bird Area (IBA) for its globally significant numbers of waterfowl and shorebirds. It is a designated Ramsar site due to its international importance as a breeding and staging area for waterfowl and other migratory birds. It is 3,578.47 hectares (8,842.6 acres) in size.