| Pettitts Animal Adventure Park | Reedham, Norfolk, England, United Kingdom | Operating | | 2 | 201.3 mi |
| | Peter Pan's Amusement Park | Ryde, Isle of Wight, England, United Kingdom | - | ≤ | - | 203.6 mi |
| Pensarn Pleasure Beach | Abergele, Conwy, Wales, United Kingdom | Operating | ≤ | - | 24.6 mi |
| Pavilion Fun Park | Clacton-on-sea, Essex, England, United Kingdom | Operating | | 1 | 209.8 mi |
| Paultons Park | Romsey, Hampshire, England, United Kingdom | Operating | | 7 | 183.3 mi |
| Old MacDonald's Farm | Brentwood, Essex, England, United Kingdom | Operating | ≤ | 1 | 186.3 mi |
| Ocean Beach Pleasure Park | South Shields, Tyne and Wear, England, United Kingdom | Operating | ≤ | 3 | 126.3 mi |
| Ocean Beach Amusement Park | Rhyl, Denbighshire, Wales, United Kingdom | - | | - | 21 mi |
| Oakwood Theme Park | Narberth, Pembrokeshire, Wales, United Kingdom | Operating | | 5 | 136.5 mi |
| | New MetroLand | Gateshead, Tyne and Wear, England, United Kingdom | - | | - | 118.6 mi |
| Needles Park | Alum Bay, Isle of Wight, England, United Kingdom | Operating | - | - | 201.5 mi |
| | Midlothian Snowsports Centre | Edinburgh, Edinburgh, Scotland, United Kingdom | Operating | s | 1 | 169.2 mi |
| | Midlands Industrial Exhibition | Nottingham, Nottinghamshire, England, United Kingdom | - | | - | 86.2 mi |
| | Miami Beach Amusement Park | Port Talbot, Neath Port Talbot, Wales, United Kingdom | - | ≤ | - | 132.1 mi |
| | Merlin's Magic Land | Lelant, Cornwall, England, United Kingdom | - | ≤ | - | 247.7 mi |
| M&Ds Scotland's Theme Park | Motherwell, North Lanarkshire, Scotland, United Kingdom | Operating | ≤ | 2 | 167.9 mi |
| | Marvel's Amusement Park | Scarborough, North Yorkshire, England, United Kingdom | - | - | - | 122.3 mi |
| Marleybrook Funfair | Canterbury, Kent, England, United Kingdom | Operating | | 1 | 232.3 mi |
| | Marine Lake Pleasure Beach | Rhyl, Denbighshire, Wales, United Kingdom | - | | - | 20.9 mi |
| Manning's Amusement Park | Felixstowe, Suffolk, England, United Kingdom | Operating | | - | 210.2 mi |
| Mack's Amusements | Cleethorpes, Lincolnshire, England, United Kingdom | Operating | ≤ | 1 | 124.1 mi |
| | Luna Park | Scarborough, North Yorkshire, England, United Kingdom | Operating | ≤ | - | 122.9 mi |
| | Loudoun Castle | Galston, East Ayrshire, Scotland, United Kingdom | SBNO | - | - | 159.2 mi |
| Lost World Adventure Park | Skegness, Lincolnshire, England, United Kingdom | - | ≤ | - | 141.4 mi |