Madison Square Park Conservancy
Not-for-profit parks charitable organization that raises funds to support horticulture, park maintenance, and park security for the Flatiron District park.
www.madisonsquarepark.org
Friends of Morningside Park
Volunteer organization dedicated to preserving and improving the park.
www.morningsidepark.org
Partnerships for Parks
Includes information on volunteering, outreach, gardens, and neighborhoods.
www.partnershipsforparks.org