The move follows a competitive process led by the Country Parks Network steering group and Natural England. Keep Britain Tidy currently runs the Green Flag Awards for parks and green spaces and the Love Parks programme.
One of the charity's three aims is to improve local places by increasing the amount of well-managed, accessible public space and engaging more communities in their management.
The Country Parks Network exists primarily to allow people who manage, or are interested in, either country parks or other green spaces that deliver similar functions to country parks, to connect with each other.
Keep Britain Tidy will be the first point of contact for the Country Parks Network and lead the management of its membership, web pages, news updates and good practice sharing. It will also host and support the Network Steering Group, with Natural England retaining a seat on the group.
The move will begin during August 2015. Existing members will be contacted by Natural England over the coming weeks with further information.