| Length: | 4.8miles |
| Mouth Location: | Massapequa Cove, Massapequa, New York |
| Subdivision Name1: |  United States |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Subdivision Type3: | County |
| Mouth Coordinates: | 40.6536°N -73.4708°W |
| Subdivision Type4: | Towns |
| Subdivision Name4: | South Farmingdale, Massapequa Park, Massapequa |
| Source1: | Western Tributary |
| Source2: | Central Tributary |
| Source3: | Eastern Tributary |
| Source1 Coordinates: | 40.7166°N -73.4582°W |
| Source2 Coordinates: | 40.7174°N -73.452°W |
| Source3 Coordinates: | 40.7172°N -73.4368°W |
| Basin Size: | 6.67mi2 |
| Source1 Location: | Bethpage Parkway & Merritts Road, Farmingdale, New York |
| Source2 Location: | Radcliffe Avenue, Farmingdale, New York |
| Source3 Location: | Main Street & Junard Drive, Farmingdale, New York |
Massapequa Creek is a long creek that runs through Nassau County, New York, and empties into South Oyster Bay. Most of the length of the creek exists within the Massapequa Preserve, a wooded area that extends from the Southern State Parkway in the north to Merrick Road in the south. The creek's headwaters extend north to Farmingdale, draining an area of .Like all other rivers on Long Island, Massapequa Creek is fed primarily by groundwater. The creek's three tributaries rise in South Farmingdale, two of which merge in a pond next to Farmingdale High School before crossing under the Southern State Parkway. It continues on the other side of the parkway, joined by the eastern tributary, and crosses Linden Street and into the Massapequa Preserve, passing through three ponds before reaching the Massapequa Reservoir. From there, a spillway takes it under Sunrise Highway into wetland areas, and then into the Massapequa Lake. Two spillways at the south end of the lake pass under Merrick Road into a canal, which leads into Massapequa Cove and South Oyster Bay.