Monomoy usually refers to Monomoy Island off of the coast of Cape Cod, Massachusetts. It may also refer to:
Monomoy Island Gunnery Range Monomoy National Wildlife Refuge Monomoy Wilderness inside the MNWR Monomoy Point Light in Chatham, Massachusetts Monomoy Shoals off the coast Monomoy Regional High School, serving Harwich and Chatham, Massachusetts
Ships USS Monomoy (AG-40), a cargo ship of the US Navy commissioned in 1918 and eventual US Coast Guard Cutter USCGC Monomoy (WAG-275), the former USS Monomoy USCGC Monomoy (WPB 1326), a US Coast Guard Cutter commissioned in 1989