| | Marvel's Amusement Park | Scarborough, North Yorkshire, England, United Kingdom | - | - | - |
| | Massapequa Zoo & Kiddie Park | Massapequa Park, New York, United States | - | - | - |
| | Maumee Kiddieland | Maumee, Ohio, United States | - | | - |
| Maviland | Samara, Samara, Russia | - | ≤ | - |
| Max Wonder Park | Shishi, Quanzhou, Fujian, China | SBNO | | 2 |
| | Maya Cable Amusement Park | Nada, Kobe, Hyōgo, Japan | - | ≤ | - |
| | McCorrough's Kiddie Park | Brooklyn, New York, United States | - | - | - |
| | McCullough Lake Park | Lima, Ohio, United States | - | ≤ | - |
| | McGuinness Amusement Park | Garden City, New York, United States | - | - | - |
| McMagic | Amman, Amman, Jordan | - | ≤ | - |
| | Mediterraneo Park | Benidorm, Alicante, Valencian Community, Spain | - | ≤ | - |
| Méga Parc | Quebec City, Québec, Canada | Operating | ≤ | 2 |
| | Mega Web | Aomi, Koto, Tokyo, Japan | - | | - |
| | Mega Wisata Icakan | Ciamis, West Java, Indonesia | - | | - |
| | MeirLand | Tel Aviv, Tel Aviv, Israel | - | - | - |
| | Meli Park Heysel | Brussels, Brussels, Belgium | - | | - |
| | Memorial Park | Williamsport, Pennsylvania, United States | - | ≤ | - |
| | Menghuan Paradise | Longhua, Haikou, Hainan, China | - | ≤ | - |
| | Menlo Park | Perkasie, Pennsylvania, United States | - | ≤ | - |
| | Meridell Park | Pocatello, Idaho, United States | - | - | - |
| | Merlin's Magic Land | Lelant, Cornwall, England, United Kingdom | - | ≤ | - |
| | Merrie Way | San Francisco, California, United States | - | | - |
| | Merriland | Loveland, Colorado, United States | - | - | - |
| | Merrimack Park | Methuen, Massachusetts, United States | - | - | - |