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- Oakfield Township, Kent County
- Oakland Charter Township, Oakland County
- Oceola Township, Livingston County
- Ocqueoc Township, Presque Isle County
- Odessa Township, Ionia County
- Ogden Township, Lenawee County
- Ogemaw Township, Ogemaw County
- Olive Township, Clinton County
- Olive Township, Ottawa County
- Oliver Township, Huron County
- Oliver Township, Kalkaska County
- Oneida Charter Township, Eaton County
- Onekama Township, Manistee County
- Onondaga Township, Ingham County
- Onota Township, Alger County
- Ontonagon Township, Ontonagon County
- Ontwa Township, Cass County
- Orange Township, Ionia County
- Orange Township, Kalkaska County
- Orangeville Township, Barry County
- Oregon Township, Lapeer County
- Orient Township, Osceola County
- Orion Township, Oakland County
- Orleans Township, Ionia County
- Oronoko Charter Township, Berrien County
- Osceola Township, Houghton County
- Osceola Township, Osceola County
- Oscoda Township, Iosco County
- Oshtemo Township, Kalamazoo County
- Ossineke Township, Alpena County
- Otisco Township, Ionia County
- Otsego Lake Township, Otsego County
- Otsego Township, Allegan County
- Otto Township, Oceana County
- Overisel Township, Allegan County
- Ovid Township, Branch County
- Ovid Township, Clinton County
- Owosso Township, Shiawassee County
- Oxford Charter Township, Oakland County
Read more about this topic: List Of Townships In Michigan