Plum Beach is a beach and surrounding neighborhood along the north shore of Rockaway Inlet, in the New York City borough of Brooklyn. It is located near the neighborhoods of Sheepshead Bay and Gerritsen Beach just off the Belt Parkway. It is named for the beach plums that grow wild there. Since 1972 it has been a part of Gateway National Recreation Area, though the parking lot and greenway that provide primary access to the shore are the responsibility of the New York City Department of Parks and Recreation and the New York City Department of Transportation. The area is part of Brooklyn Community District 15 and served by Brooklyn Community Board 15.

In May and June, horseshoe crabs climb onto the beach to mate.

Plum Beach is not clean enough to be used safely for recreational swimming. Many marooned and abandoned small boats can be seen from the beach. Furthermore, the beach is often subjected to heavy beach erosion, as incoming storms often blow large amounts of water up the Rockaway Inlet past the beach into Jamaica Bay. Plum Beach's isolation, and its proximity to the Belt Parkway has made the beach attractive to people who are cruising for sex. This has occasionally led to violence. In the summer, Plum Beach attracts kiteboarding enthusiasts, as the southerly sea breeze makes the area ideal for this use.

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