- Laing Art Gallery - Newcastle upon Tyne
- Lake District Wildlife Park - Keswick
- Lakeland Maze Farm Park - Sedgwick, Kendal
- Lakeland Miniature Village - Flookburgh, Grange-over-Sands
- Lakeland Motor Museum - Backbarrow, Ulverston
- Lakeland Wildlife Oasis - Hale, Milnthorpe
- Lakes Aquarium - Newby Bridge
- Lamb House - Rye
- Lamport Hall and Gardens - Lamport
- Land of Lost Content - Craven Arms
- Land Of Play - Manchester
- Landguard Fort - Felixstowe
- Langham Glass - Fakenham
- Lanhydrock - Bodmin
- Lappa Valley Steam Railway - Newquay
- Lapworth Museum of Geology - Edgbaston, Birmingham
- Larmer Tree Gardens - Tollard Royal, Salisbury
- Laser Labyrinth - Worksop
- Laser Quest and The Rock - Manchester
- Laserforce Leicester - Leicester
- Laurel and Hardy Museum - Ulverston
- Lavenham Guildhall - Sudbury
- Lawrence House Museum - Launceston
- Lea Gardens - Lea, Matlock
- Leeds Art Gallery - Leeds
- Leeds Industrial Museum at Armley Mills - Armley, Leeds
- LEGOLAND Discovery Centre Manchester - Manchester
- LEGOLAND Windsor - Windsor
- Leighton Buzzard Railway - Leighton Buzzard
- Leighton Hall - Carnforth
- Lemur Landings Soft Play - Poole
- Leominster Museum - Leominster
- Lichfield Heritage Centre - Lichfield
- Lightwater Valley - North Stainley, Ripon
- Lilliput Antique Doll and Toy Museum - Brading
- Lillyputt Minigolf - Broadstairs
- Lincoln Cathedral - Lincoln
- Lindisfarne Castle - Holy Island, Berwick-upon-Tweed
- Linton Zoo - Linton
- Little Acorns - Worcester
- Little Bees Play and Party - Leeds
- Little Hall Lavenham - Lavenham
- Little Harts Pottery Studio - Astbury
- Little Moreton Hall - Congleton
- Little Urchins Softplay - Warminster
- Liverpool Cathedral - Liverpool
- Llanerchaeron - Ciliau Aeron, near Aberaeron, Ceredigion
- Lodge Park and Sherborne Estate - Aldsworth, near Cheltenham
- Long Shop Steam Museum - Leiston
- Longdown Activity Farm - Ashurst, Near Southampton
- Longleat Safari and Adventure Park - Warminster
- Lord Leycester Hospital - Warwick
- Loseley Park - Guildford
- Lunt Roman Fort - Baginton
- Lyddington Bede House - Lyddington, Leicester
- Lydiard House and Park - Lydiard Tregoze, Swindon
- Lyme Park, House and Garden - Disley, Stockport
- Lytes Cary Manor - near Somerton
- Lytham Windmill Museum - Lytham
- Lyveden New Bield - near Oundle
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