Marrowstone Point Light, Maritime navigation aid at Marrowstone Island, Jefferson County, United States

Marrowstone Point Light is a small, square, white-painted concrete building at the northern tip of Marrowstone Island, marking the eastern entrance to Port Townsend Bay. A 250 mm optical system is mounted on a short mast, and the fog horn is housed inside. The 1896 wooden keeper's house stands nearby.

Marrowstone Point was first marked in 1888 with a lens lantern on a pole. In 1896 a fog bell was added and a one-and-a-half-story dwelling was built for the first keeper, sea captain Osmond Hale Morgan, who came from Whidbey Island with his wife Frances and five children. In 1912 the light was placed on a small concrete structure, and in 1918 a square cement fog signal building with three large trumpets was put into service after mariners complained the bell was often inaudible.

The station's first keeper, Captain Osmond Hale Morgan, arrived from Whidbey Island in 1896 with his wife Frances Elizabeth and their five children to occupy the new one-and-a-half-story dwelling. The 1896 keeper's quarters, a wooden building, still stands beside the light and now serves as office and living space for the U.S. Geological Survey's Marrowstone Marine Field Station.

The lighthouse is visible from the beach at Fort Flagler State Park, making it easy to spot from the shore. Since the facility operates as a research station, visitors should stay on the beach or in designated park areas.

The 1918 square concrete fog-signal building held three large trumpets, replacing a bell mariners said was often inaudible. The light was mounted on its roof, and the 1896 keeper's quarters nearby now serve the USGS Marrowstone Marine Field Station.