| | 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 | - | - | - |
| | Metalworkers' Palace | Tula, Tula, Russia | - | ≤ | - |
| | Meteor Valley Water Park | Bao'an, Shenzhen, Guangdong, China | - | | - |
| Me World | Busan, South Korea | - | | - |
| | Meyer's Lake Park | Canton, Ohio, United States | - | - | - |
| | MGM Grand Adventures | Las Vegas, Nevada, United States | - | | - |
| | MGM Selvee World | Visakhapatnam, Andhra Pradesh, India | - | ≤ | - |
| | Miami Beach Amusement Park | Port Talbot, Neath Port Talbot, Wales, United Kingdom | - | ≤ | - |
| | Midland Beach Park | Staten Island, New York, United States | - | - | - |