| EGNP | Leeds Heliport | — | Heliport |
| EGBG | Leicester Airport | Leicester, Leicestershire | Small airport |
| GB-1041 | Lempitlaw Farm Airstrip | — | Small airport |
| GB-0651 | Lennox Plunton Airstrip | Kirkcudbright | Small airport |
| ADX | Leuchars Station Airfield | Leuchars, Fife | Medium airport |
| GB-0500 | Lindens Farm Airstrip | Grimsby, Lincolnshire | Small airport |
| GB-0172 | Lingcroft Grass Airstrip | Workington, Cumbria | Closed |
| GB-1335 | Lisburn Heliport | Lisburn, County Down | Heliport |
| GB-0642 | Liskeard Heliport | Liskeard, Cornwall | Heliport |
| GB-0237 | Little Chase Farm Airstrip | Kenilworth, Warwickshire | Small airport |
| GB-0293 | Little Down Farm Airstrip | Kidderminster, Worcestershire | Small airport |
| GB-0834 | Little Engeham Farm Airstrip | Ashford, Kent | Small airport |
| GB-1019 | Little Farm Airstrip | Lincoln, Lincolnshire | Small airport |
| EGMJ | Little Gransden Airfield | Gamlingay, Cambridgeshire | Small airport |
| GB-0809 | Little Haugh Hall Private Airfield | Bury Saint Edmunds, Suffolk | Small airport |
| GB-0835 | Little Robhurst Airstrip | Ashford, Kent | Small airport |
| GB-0918 | Little Shelford Airstrip | Cambridge, Cambridgeshire | Small airport |
| GB-0394 | Little Snoring Airfield | Fakenham, Norfolk | Small airport |
| GB-0274 | Little Staughton Airfield | Great Staughton, Cambridgeshire | Small airport |
| EGFD | Llanbedr Airfield | Llanbedr | Small airport |
| GB-0863 | Llangarron Private Airstrip | Ross-on-Wye, Herefordshire | Small airport |
| GB-0429 | Lleweni Parc Glyndwr Soaring Club | — | Small airport |
| GB-0828 | Loadman Farm Airstrip | Hexham (Northumbria) | Small airport |
| GB-1200 | Loch Tay Water Aerodrome | Kenmore, Perth and Kinross | Seaplane base |
| GB-1201 | Loch Voil Water Aerodrome | Balquhidder, Stirling | Seaplane base |
| GB-0821 | Lodge Farm Airstrip | Clacton-on-Sea, Essex | Small airport |
| GB-0507 | Lodge Farm Airstrip | Upper Heyford | Closed |
| GB-0717 | Lodge Field House Airstrip | Gilling East, Yorkshire | Small airport |
| BQH | London Biggin Hill Airport | London | Medium airport |
| GB-0615 | London Gliding Club | Dunstable, Central Bedfordshire | Small airport |
| EGLW | London Heliport | London | Heliport |
| OXF | London Oxford Airport | Kidlington, Oxfordshire | Medium airport |
| GB-0672 | London Red Bull Airport | London | Closed |
| GB-0368 | Long Acres Farm | Sandy, Central Bedfordshire | Small airport |
| GB-1229 | Long Marston Airfield | Long Marston, Warwickshire | Closed |
| GB-0264 | Long Stratton Airstrip | Long Stratton | Small airport |
| GB-0883 | Longford Airstrip | Market Drayton, Shropshire | Small airport |
| GB-1145 | Longleat Red Bull Airport | Warminster, Wiltshire | Closed |
| EGPS | Longside Airfield | Peterhead | Small airport |
| GB-0174 | Lorn and Islands District General Hospital Heliport | Oban, Argyll and Bute | Heliport |
| GB-0855 | Lotmead Farm Airstrip | Wanborough (Wilts) | Small airport |
| GB-0487 | Loughbrickland Airstrip | Banbridge | Closed |
| GB-0247 | Low Farm Airstrip | Norwich, Norfolk | Closed |
| GB-1032 | Low Moor Farm Airstrip | — | Small airport |
| GB-0550 | Lower Botrea | Grumbla, Cornwall | Small airport |
| GB-0276 | Lower Grounds Farm Airstrip | Telford, Shropshire | Small airport |
| GB-0053 | Lower Manor Farm Airstrip | Weymouth, Dorset | Small airport |
| GB-0984 | Lower Park Farm Airstrip | — | Small airport |
| GB-0042 | Lower Upham Airfield | Southampton, Hampshire | Small airport |
| GB-0044 | Lower Upham Farm Aerodrome | Marlborough, Wiltshire | Small airport |
