The Metropolitan Park System of Greater Boston is a system of reservations, parks, parkways and roads under the control of the Massachusetts Department of Conservation and Recreation (DCR) in and around Boston that has been in existence for over a century. The title is used by the DCR to describe the areas collectively: "As a whole, the Metropolitan Park System is currently eligible for listing on the National Register of Historic Places", as outlined on the department's website. The DCR maintains a separate Urban Parks and Recreation division to oversee the system, one of five such divisions within the department—DCR's Bureau of State Parks and Recreation manages the remainder of Massachusetts state parks. Direct design and maintenance functions for the parkways and roads within the system are provided by the DCR Bureau of Engineering.

The Department of Conservation and Recreation (DCR) is a state agency of the Commonwealth of Massachusetts, United States, situated in the Executive Office of Energy and Environmental Affairs. It is best known for its parks and parkways. The DCR's mission is "To protect, promote and enhance our common wealth of natural, cultural and recreational resources for the well-being of all." The agency is the largest landowner in Massachusetts.