The Fort Humboldt State Historic Park is a historic site and state park in Eureka, California. It is home to the North Coast regional headquarters of the California State Parks as well.

The Fort Humboldt State Historic Park was created in 1955 in efforts to preserve the site where Fort Humboldt once stood. The fort was built in 1853 and was used by the Army for 13 years. It initially protected settlers from hostile Native Americans, and then became a base during the Civil War years. Its most popular occupant was Captain Ulysses S. Grant, who later became a general and president of the United States.

Today, the site is home to several historic reconstructions of early buildings found in the fort, a logging and fort museum, picnic areas, machinery displays, and a bookstore.