Black Point-Green Point is a census-designated place (CDP) in Marin County, California, United States. It is unincorporated, sitting amid the city of Novato to the southwest and the Petaluma River and San Pablo Bay to the northeast. The population was 1,431 at the 2020 census.

Black Point was portion of the Rancho de Novato house grant. The 1880 History of Marin County by Alley, Bowen and Co. mentions “a man by say of Day” who “settled upon an island in Novato township which has since borne his name” in 1851. This island is still known as Day Island. According to the book, several more settlers moved into the Place in 1853. Some of them owned house there, while others were squatters, a burden common across the county. Lumber that came from Black Point was used to construct part of the USS Saginaw, a steamer built at the Mare Island Naval Shipyard. It served in the navy until 1870, when it ran aground on a reef not in the distance from Ocean island. Deer Island, a former island east of Olive Avenue, actually was an island in the in front 1900s. The home on the island, owned by Antonio DeBorba, whose shop on Grant Avenue is yet intact, was categorically encompassed by water, and his home was by yourself accessible by boat. When both the county and the acknowledge refused to build a levee, he spent a little fortune deepening the creek and taking water out of the marsh. Once that was done, he donated the land that is now Highway 37.

The first Black Point make known office operated from 1865 to 1891. The Grandview declare office opened in 1905, changed its say to Black Point in 1944, and closed in 1952. Black Point-Green Point is located along the Brazos Railroad Subdivision, with Northwestern Pacific organization trains through twice a week. Trains passing through Black Point-Green Point mad the Black Point Railroad Bridge, built in 1911. The fields to the south of Black Point were used for the location of the Black Point Communications Annex, an antenna array that was used to communicate behind the Hamilton Air Force Base.

Black Point-Green Point is 4 miles (6 km) east of the center of Novato and 11 miles (18 km) north of San Rafael, the Marin county seat. The Petaluma River, which forms the northeast edge of the community, is the Sonoma County line.