The Belt Parkway is the name given to a series of controlled-access parkways that form a belt-like circle around the New York City boroughs of Brooklyn and Queens. The Belt Parkway comprises three of the four parkways in what is known as the Belt System: the Shore Parkway, the Southern Parkway (not to be confused with the Southern State Parkway), and the Laurelton Parkway. The three parkways in the Belt Parkway are a combined 25.29 miles (40.70 km) in length. The Cross Island Parkway makes up the fourth parkway in the system, but is signed separately.

The Shore Parkway, Southern Parkway, Laurelton Parkway, and Cross Island Parkway are collectively known as the "Belt System". The four components of the Belt System are designated as New York State Route 907C (NY 907C), NY 907D, NY 907B, and NY 907A, respectively, by the New York State Department of Transportation. All four numbers are reference route designations and are not signed. Excluding the Cross Island Parkway, the other three segments are now known collectively as the official "Belt Parkway". It is designated an east–west route, and its exit numbering system begins, in standard fashion, at the western terminus of the Shore Parkway, the westernmost parkway in the system. The numbering increases as the parkway proceeds eastward, and continues onto the Cross Island at the eastern terminus of the Belt Parkway. The north–south parkway retains the numbering scheme to its northern terminus.

The Belt Parkway begins at an interchange (exit 22) with the Gowanus Expressway in the Bay Ridge section of Brooklyn. Paralleling Third Avenue, the parkway turns west and crosses over the Long Island Rail Road Bay Ridge Branch, a freight-only line. Bypassing Bay Ridge, the Belt passes exit 1, which services 65th–67th Streets in Bay Ridge. Crossing south past Owl's Head Park, the parkway turns southward and enters Shore Road Park, paralleling the shore of the Upper New York Bay. The eastbound lanes of the Belt Parkway pass several small parking areas that serve as viewing spots for the bay. Connections across the parkway to Bay Ridge are also present at these parking areas. Beginning the bend to the southeast, the parkway passes Andrew Lehman Field.

Just east of the field, the Belt Parkway comes within the shadows of the Verrazzano-Narrows Bridge and passes exit 2, which serves as the southern terminus of Fourth Avenue. After crossing under the bridge, the westbound lanes enter exit 3 which connects to the Verrazzano. Eastbound, the lanes from the bridge connecting to the Belt merge in, as the road enters Dyker Beach Park and Golf Course. During a short gap away from the shore, the Belt passes a parking area for Dyker Beach Park, entering exit 4, which services Bay 8th Street and 14th Avenue. Continuing along the park, the Belt begins to parallel Cropsey Avenue and passes another parking area before reaching exit 5, a junction with Bay Parkway. This marks the eastern end of Dyker Beach Park, and the route begins to parallel shoreline strip malls before reaching Calvert Vaux Park.

Now in the Gravesend section of Brooklyn, the Belt passes exit 6, which connects to Cropsey Avenue. Westbound, this junction is split into exit 6N and exit 6S, also serving Stillwell Avenue. The parkway bends eastward and crosses over the Coney Island Complex, a large railroad yard for the New York City Subway. Just before passing exit 7, the eastbound lanes cross just north of the Neptune Avenue subway station. Exit 7 eastbound services Ocean Parkway, which is met by exit 7B proceeding westbound. Westbound, exit 7A services Shell Road in Gravesend. Paralleling the namesake Neptune Avenue, the parkway enters Sheepshead Bay and connections to Coney Island.

At exit 8, the Belt Parkway connects to Coney Island Avenue, approaching the namesake bay as it continues east. Paralleling Emmons Avenue through Sheepshead Bay, the parkway passes exit 9A eastbound, which connects to Knapp Street and exit 9B, which is a ramp to the eastern end of Emmons Avenue. Westbound, exit 9 services Knapp Street. Crossing south of Gerritsen Beach, the parkway passes south of the Plum Beach Channel and passes a small rest area on the eastbound lanes. Turning northeast through the Floyd Bennett Field area, the parkway bends north and passes a service area with gas services in the median. Just north of the service area, the Belt passes exit 11N–S, a cloverleaf interchange which connects to Flatbush Avenue and the Rockaways.

After exit 11N, the Belt Parkway continues east through Floyd Bennett Field, crossing over the Mill Basin Drawbridge into Brooklyn Beach and passes the entrance to the Jamaica Bay Riding Academy, the only business served directly on the parkway. Crossing over another bridge, the parkway enters the Canarsie section of Brooklyn. The parkway, now running northeast, parallels a bicycle path, reaching Canarsie Pier and exit 13, which serves as the southern end of Rockaway Parkway. Crossing over another bridge over Spring Creek, the parkway passes exit 14, which connects to Pennsylvania Avenue in Starrett City. The interchange is adjacent to the former Pennsylvania Avenue Landfill. After crossing another waterway, Hendrix Creek, the Belt passes the former Fountain Avenue Landfill and passes exit 15, a diamond interchange with Erskine Street leading to the Gateway Center shopping complex.

Now crossing over the Old Mill Basin section of Jamaica Bay, the Belt Parkway continues northeast in the borough of Queens, entering exit 17N–S, Cross Bay Boulevard and Cohancy Street, which also connects to the Cross Bay Bridge and towards the Rockaways. Crossing into an interchange with NY 27, the parkway travels under the IND Rockaway Line (A train) and passes exit 18B, which connects to Aqueduct Racetrack in Ozone Park.

Now on the Southern Parkway section of the Belt, the Belt continues eastward into exit 19, which connects to NY 878 (the Nassau Expressway) and indirectly with I-678, the Van Wyck Expressway. This interchange also serves as access to John F. Kennedy International Airport. Now with North and South Conduit Avenues serving as westbound and eastbound frontage roads for the parkway, passing exit 20, a junction with the JFK Expressway and the airport. Crossing under the Van Wyck, the Belt continues east through multiple underpasses and overpasses before reaching exit 21A, westbound side, which services 150th Street and Rockaway Boulevard. Crossing under Guy R. Brewer Boulevard, the Belt passes exit 21B, which connects to Farmers Boulevard and Guy R. Brewer Boulevard.

Exit 22 services Springfield Boulevard, where the Belt Parkway begins to parallel a Long Island Rail Road line through Laurelton. Westbound, exit 23A services North Conduit Boulevard (NY 27) and 225th Street, while eastbound, exit 23B services NY 27 and the Sunrise Highway. At this junction, the parkway turns northeast and joins the Laurelton Parkway segment, which connects to exit 24A, Merrick Boulevard (also known as Floyd H. Flake Boulevard) in both directions, and Francis Lewis Boulevard on the eastbound lanes. Exit 24B on the eastbound lanes connects also to Merrick Boulevard and 130th Avenue and on the westbound lanes connect Francis Lewis Boulevard. Just after crossing under 130th Avenue, the Belt passes exit 25A–B. At this interchange, the Laurelton Parkway segment ends, with exit 25A connecting to the western terminus of the Southern State Parkway and exit 25B servicing Elmont Road.

At this interchange, the Belt Parkway crosses over the Southern State and becomes the Cross Island Parkway, which continues north through Queens, connecting to I-495, the Grand Central Parkway and eventually I-678, the Whitestone Expressway.

The Belt Parkway was proposed by public official and highway advocate Robert Moses on February 25, 1930 to provide highway access to Manhattan and to connect to, and use similar design principles to, parkways already constructed on Long Island and Westchester County, New York. At the time, the Belt project was referred to as the "Marginal Boulevard". The Belt system was part of a "Metropolitan Loop" running through all five boroughs of New York City as well as New Jersey, proposed by the Regional Plan Association in 1929. Other highways proposed in this loop included the future Cross Bronx Expressway and Staten Island Expressway.

In a 1937 report titled "New Parkways in New York City", the New York City Parks Department proposed the Belt Parkway in the following outline:

The Circumferential Parkway begins at Owl's Head Park at the Narrows, and follows the Shore Drive through Fort Hamilton and Dyker Beach Park. The City of New York was vested title in an extension along Gravesend Bay to Bensonhurst Park, and is about to acquire the remaining rights-of-way up to Guilder Avenue, including sufficient land for the conversion of Guilder Avenue into a genuine parkway with service roads. It is proposed to acquire the rights-of-way for the extension of Guilder Avenue by means of a new parkway parallel to, and north of Emmons Avenue to the Marine Parkway extension, for which land is already in the possession of the City. It is proposed to carry the Circumferential Parkway from Flatbush Avenue where the Marine Parkway extension ends, along or near Jamaica Bay to a point on Southern Parkway, just east of the Rockaway division of the Long Island Railroad in Queens. Work on the conversion of the Sunrise Highway into a genuine parkway is already under way. This will be known as Southern Parkway.

Construction began in 1934. New highway designs were implemented, including dark main roads and lighter-colored entrance and exit ramps. The parkway first opened on June 29, 1940, with most of Cross Island, Southern, and Shore Parkway sections completed. A 12-mile (19 km) bike path along the Southern Brooklyn section of the Belt Parkway opened in 1941.

The construction of Belt Parkway entailed:

• 11,800,000 cubic yards (9,000,000 m) of hydraulic fill pumped
• 4,800,000 cubic yards (3,700,000 m) of dry fill moved
• 1,500,000 square yards (1,300,000 m) of pavement used
• 530,000 cubic yards (410,000 m) of concrete used
• 11,500 cubic yards (8,800 m) of masonry used
• 400,000 feet (120,000 m) of piles used
• 320,000 short tons (290,000 long tons) of steel used
• 9,000 men employed

All the original parkways, except the Gowanus, were built on grassy rights-of-way with trees, in a more green surrounding than most highways of their time. To build sections between exits 7 and 8 in the 1930s parts of Coney Island Creek were filled in, finishing the process, begun over a decade before construction began, of turning Coney Island from an island into a peninsula. The Gowanus Parkway, in part replacing the demolished Fifth Avenue Line, was built as an elevated structure over Third and Hamilton Avenues in order to avoid the active docks and industrial areas including Sunset Park, Brooklyn.

Like most parkways in New York State, the parkways comprising the Belt System were closed to commercial traffic, including any vehicle with a non-passenger registration and all commercial trucking of any size. Originally even station wagons, which had "suburban" registrations, were excluded but they were later allowed, along with passenger-registered SUVs and vans.

The Belt Parkway formed the southern portion of a system of parkways and highways that connected every borough except Staten Island. At its eastern end, the Belt Parkway became the Cross Island Parkway, which connected to the Bronx–Whitestone Bridge and the Hutchinson River Parkway in the east Bronx. At its western end, the Belt Parkway led to the Gowanus Parkway, the Brooklyn–Battery Tunnel, the West Side Elevated Highway, and the Henry Hudson Parkway to the west Bronx. The Henry Hudson and Hutchinson River parkways were connected in the Bronx via Van Cortlandt Park, Mosholu Parkway, and Pelham Parkway, all of which were service-level roads. Some portions of the original system were converted to expressways, which could be used by commercial traffic. The Gowanus Expressway replaced the Gowanus Parkway in 1950 and became part of the Interstate Highway System as I-278. The Whitestone Parkway was expanded into the Whitestone Expressway starting in 1957; it also became an Interstate Highway and is signed as part of I-678. In the late 1940s, the parkway was widened in its entirety.

In 1969, the New York City Council co-named the Belt Parkway Leif Ericson Drive between exit 2 and exit 9, to recognize the large Scandinavian population in Bay Ridge. By 1970, signage on much of the parkway's length (except for the Cross Island Parkway section) had been replaced by signs reading "Belt Parkway". The segment of NY 27A that ran concurrently with the parkway was removed in 1972. In the 1980s, the viaduct carrying traffic over the Coney Island Yard was reconstructed. In September 2002, Exit 15 was opened to serve the nearby Gateway Center commercial development. in 2005, a project to reconstruct Exit 17 was competed. The old cloverleaf interchange was demolished, and a new Diamond interchange with wider deacceleration lanes and gentler turns was constructed in its place.

In October 2009, NYCDOT launched the first phase of a capital project to reconstruct seven obsolete bridges along the Belt Parkway. The first phase included the reconstruction of an overpass ramp from Guider Avenue, as well as the replacement of the Paerdegat Basin and Rockaway Parkway bridges, which was completed in 2012. In 2021, the Metropolitan Transportation Authority proposed widening a 2-mile (3.2 km) section of the Belt Parkway near the Verrazzano-Narrows Bridge.

County	Location	mi	km	Old exit	New exit	Destinations	Notes
Brooklyn	Sunset Park	0.00	0.00		0	I-278 east (Brooklyn–Queens Expressway) – Queens, Bronx	Western terminus; exit 22 on I-278
	Bay Ridge	0.80– 1.20	1.29– 1.93	5	1	To 65th–67th Streets	Access via Shore Road
	Fort Hamilton	3.10– 3.50	4.99– 5.63	6	2	4th Avenue / Fort Hamilton Parkway
		3.70	5.95		3	I-278 west (Verrazzano-Narrows Bridge) – Staten Island	Westbound exit and eastbound entrance; exit 16 on I-278
	Fort Hamilton–Bath Beach line	4.47	7.19	7	4	Bay 8th Street / 14th Avenue
	Bath Beach–Gravesend line	5.63	9.06	8	5	Bay Parkway
	Gravesend	6.40– 6.80	10.30– 10.94	9	6	Cropsey Avenue / Stillwell Avenue – Coney Island	Signed as exits 6S (south) and 6N (north) westbound
		7.40– 8.20	11.91– 13.20	10	7A	Shell Road – Coney Island	Westbound exit and eastbound entrance; former exit 7S
				11	7B	Ocean Parkway	Signed as exit 7 eastbound; former exits 7S-N
	Sheepshead Bay	7.80– 8.50	12.55– 13.68	12	8	Coney Island Avenue
		9.30	14.97	13A	9	Knapp Street – Sheepshead Bay	Eastbound exit and westbound entrance
		10.20	16.42	13B	10	Knapp Street – Sheepshead Bay	No westbound entrance; Sheepshead Bay not signed eastbound; signed as exit 9 westbound
	Gerritsen Inlet	10.70	17.22	Bridge
	Floyd Bennett Field	11.30– 11.80	18.19– 18.99	14	11	Flatbush Avenue – Rockaways, Marine Park	Signed as exits 11S (south) and 11N (north)
	Bergen Beach	12.70	20.44		12	Jamaica Bay Riding Academy	Eastbound exit and entrance; dead end
	Paerdegat Basin	13.55	21.81	Bridge
	Canarsie	14.38	23.14	15	14	Rockaway Parkway
	East New York	15.42	24.82	16	15	Pennsylvania Avenue
		16.20	26.07		16	Erskine Street
Queens	Howard Beach	17.60– 19.00	28.32– 30.58	17	17S-N	Cross Bay Boulevard / Cohancy Street – Woodhaven, Rockaways	Signed as exits 17S (south) and 17N (north) westbound
				18	17W	NY 27 west (North Conduit Avenue)	No eastbound exit
	South Ozone Park	18.70– 19.20	30.09– 30.90	19	18	Lefferts Boulevard – Aqueduct Racetrack, Long-Term Parking	Eastbound exit is part of exit 19
		18.30– 20.20	29.45– 32.51	20	19	I-678 (Van Wyck Expressway) / NY 878 east (Nassau Expressway) – Kennedy Airport	No westbound access to I-678 south/NY 878; exits 1E-W on I-678
		21.00– 21.30	33.80– 34.28	21	20	JFK Expressway south – Kennedy Airport	Westbound exit and eastbound entrance; northern terminus of JFK Expressway
	Springfield Gardens–Rochdale line	19.60– 21.50	31.54– 34.60	22	20 (EB) 21A (WB)	150th Street / Rockaway Boulevard
		21.20– 22.20	34.12– 35.73	23	21B	Farmers Boulevard / Guy R. Brewer Boulevard	No eastbound access to Guy R. Brewer Boulevard
		21.80– 22.40	35.08– 36.05		22	Springfield Boulevard
	Laurelton–Brookville line	22.80	36.69		23B	NY 27 east (Sunrise Highway) / Brookville Boulevard	Eastbound exit and westbound entrance
	Laurelton–Rosedale line	23.30	37.50		23A	North Conduit Avenue (NY 27 west) / 225th Street	Westbound exit only
		23.40– 23.70	37.66– 38.14		24A	Merrick Boulevard / Francis Lewis Boulevard	Merrick Boulevard not signed westbound
		23.90	38.46		24B	Merrick Boulevard / 130th Avenue	Signed for Merrick Blvd. westbound, 130th Avenue eastbound
	Cambria Heights	25.1	40.4		25A	Southern State Parkway east – Eastern Long Island	Northbound exit and southbound entrance; western terminus of Southern State Parkway
		25.2	40.6		25B	Elmont Road / Linden Boulevard	Northbound exit only
		25.29	40.70		–	Cross Island Parkway north – Whitestone Bridge	Continuation north
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Electronic toll collection       Incomplete access

• Belt Parkway at Alps' Roads
• Belt Parkway (Greater New York Roads)
• Belt Parkway (Jeff's Parkway Site: Photo Gallery)