- M Shed - Bristol
- Mabie Farm Park - Mabie, Dumfries
- Mablethorpe Seal Sanctuary and Wildlife Centre - Mablethorpe
- Madame Tussauds Blackpool - Blackpool
- Magicland - Cirencester
- Magna Science Adventure Centre - Templeborough, Rotherham
- Maidenhead Heritage Centre - Maidenhead
- Maister House - Hull
- Maize Maze at Cawthorne - Cawthorne, Barnsley
- Manchester Cathedral - Manchester
- Manchester Climbing Centre - Manchester
- Manchester Jewish Museum - Manchester
- Manic Ceramics – Hereford - Hereford
- Manor Farm and Woodlands - East Leake, nr Loughborough
- Manor Heath Park and Jungle Experience - Halifax
- Manor House Wildlife Park - St Florence, Tenby, Pembrokeshire
- Manydown Family Fun - Basingstoke
- Mapperton - Beaminster
- Marlow Museum - Stoke Marlow
- Marwell Wildlife - Winchester
- Mary Arden’s Farm - Stratford-upon-Avon
- Maryport Maritime Museum - Maryport
- Matlock Bath Aquarium and Exhibitions - Matlock Bath
- Matlock Farm Park - Matlock
- Mattel Play! Liverpool - Liverpool
- Mead Open Farm - Billington
- Megakidz - Sheffield
- Melford Hall - Long Melford, Sudbury
- Melsop Farm Park - Scoulton, Nr Watton
- Melton Carnegie Museum - Melton Mowbray
- Mercer Art Gallery - Harrogate
- Merseyside Maritime Museum - Liverpool
- Mevagissey Museum - Mevagissey
- Middleham Castle - Middleham
- Milestones Museum of Living History - Basingstoke
- Millie Meerkat’s Playbarn - Bridgnorth
- Milton Keynes Museum Wolverton, Milton Keynes
- Mini and Maxi Moos Adventure Farm - Durham
- Mini Meadows Farm - Welford
- Mini’s Play Centre - Preston
- Mister Twisters Gateshead - Gateshead, Wardley
- Mister Twisters Hartlepool - Hartlepool
- Mompesson House - Salisbury
- Monk Park Farm Visitor Centre - Bagby, Thirsk
- Monkey Bizness Gosport - Gosport
- Monkey World Ape Rescue Centre - Longthorns, Wareham
- Monkwearmouth Station Museum - Sunderland
- Moot Hall - Elstow, Bedford
- Moseley Old Hall - Wolverhampton
- Mother Shipton’s Cave - Knaresborough
- Mottisfont - near Romsey
- Mount Grace Priory - Northallerton
- Mr Bubbles Play Centre - Oswaldtwistle, Accrington
- Mr Straw’s House - Worksop
- Mudchute Park and Farm - Isle of Dogs, London
- Muncaster Castle and Gardens - Ravenglass
- Museum of Berkshire Aviation - Woodley, nr Reading
- Museum of Brands, Packaging and Advertising - Notting Hill
- Museum of British Surfing - Braunton
- Museum of Cannock Chase - Hednesford
- Museum of Carpet - Kidderminster
- Museum of Computing - Swindon
- Museum of Lakeland Life and Industry - Kendal
- Museum of Norwich at the Bridewell - Norwich
- Museum of Nottingham Life at Brewhouse Yard - Castle Boulevard, Nottingham
- Museum of Science and Industry - Manchester
- Museum of the History of Science - Oxford
- Museum of the Horse - Tuxford
- Museum of the Jewellery Quarter - Hockley, Birmingham
- Museum of Transport Greater Manchester - Manchester
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