County highway in Mackinac and Luce counties in Michigan, United States
H-33 is a county-designated highway in the Upper Peninsula of the US state of Michigan between Gould City and McMillan that was previously M-135, a former state trunkline highway. The roadway follows Manistique Lakes Road from Gould City at a junction with US Highway 2 (US 2) near Lake Michigan north to M-28 near McMillan. The northern section of the highway is also called County Road 135 (CR 135) in Luce County.
From 1929 until 1960, the road was part of the state highway system as M-135. The northern end of the highway always contained a section that ran concurrently with M-98, another state highway in the area. For a period in the 1950s, M-135 had a different northern terminus separate from M-98's endpoint. A few years before both highways were removed from the highway system, M-135 was moved to use M-98's terminus with M-28. Since the 1970s, M-135 has been a part of the county-designated highway system and assigned the number H-33, a moniker it has borne since.