New York State Route 9G (NY 9G) is a state highway in the Hudson Valley of New York in the United States. It runs north from U.S. Route 9 (US 9) at Poughkeepsie, starting out as Violet Avenue, then follows the Hudson River mostly along the eastern side of the US 9 to Rhinebeck, where the two routes cross just north of the village. From this point onward, NY 9G runs on the western side of US 9, closer to the Hudson River, to Hudson. It ends at another junction with US 9 in the city. NY 9G initially extended from Rhinebeck to Hudson when it was assigned as part of the 1930 renumbering of state highways in New York. It was extended to its current length in the late 1930s, supplanting New York State Route 9F, an alternate route of US 9 between Poughkeepsie and Rhinebeck.
NY 9G was assigned as part of the 1930 renumbering of state highways in New York; however, it extended only from US 9 in Rhinebeck to US 9 in Hudson. South of Annandale-on-Hudson, NY 9G was routed on River and Mount Rutsen Roads. The portion of NY 9G between Germantown and NY 199, under construction in 1930, was opened to traffic from NY 199 to Tivoli by the following year and completed c. 1932. Farther south, an alternate route of US 9 between Poughkeepsie and Hyde Park via East Park was designated NY 9F as part of the renumbering. NY 9F was extended northward c. 1932from East Park to Rhinebeck, where it ended at a junction with US 9 northeast of the village. NY 9F was absorbed into a rerouted and extended NY 9G c. 1938.
The former routing of NY 9G from Annandale-on-Hudson to Mount Rutsen Road along River Road is now maintained by Dutchess County as part of CR 103. In Hyde Park, the former alignment of NY 9F along Market Street remained state-maintained until April 1, 1980, when it was transferred from New York State to Dutchess County as part of a highway maintenance swap between the two levels of government. Market Street is now part of CR 41.
It has also been the site of a stretch of fatal or otherwise serious car accidents, some of which have involved hit and runs. A group of legislators is currently working on improving safety of the road between Bard College and Germantown.