Monadnock may refer to:
A geologic term Monadnock or "inselberg", a generic term for isolated mountain
Names of summits Mount Monadnock, a well-known summit in southwestern New Hampshire, United States, located in the town of Jaffrey Monadnock Mountain (Vermont), a summit in Lemington, Vermont, United States Pack Monadnock, a mountain in the Wapack Range of southern New Hampshire North Pack Monadnock, a mountain in the Wapack Range of southern New Hampshire Little Monadnock Mountain, a mountain located in southern New Hampshire in the towns of Troy and Fitzwilliam
Hiking trails Metacomet-Monadnock Trail, a hiking trail located in western Massachusetts and southern New Hampshire Monadnock-Sunapee Greenway, a hiking trail located in southwestern New Hampshire
Architecture The Monadnock Building, a proto-skyscraper located in the city of Chicago, Illinois The Monadnock Building (San Francisco)
Business Monadnock Lifetime Products, a law enforcement equipment company
Ships USS Monadnock, various ships of the United States Navy with this name