- Langton, John
- Lawson, Philip Hugh
- Lee, Archibald Henry
- Leeworthy, Daryl
- Lerry, George Geoffrey
- Lethbridge, John P.
- Levi, Thomas Arthur
- Lewis, Aneirin
- Lewis, David Hughes
- Lewis, David Wyre
- Lewis, Henry
- Lewis, Hywel David
- Lewis, Hywel Meilir Pennant
- Lewis, Idwal
- Lewis, John Daniel Vernon
- Lewis, Mary Gwyneth
- Lewis, Megan
- Lewis, Thomas
- Lewis, Thomas Harris
- Lewis, Vyrnwy John
- Linnard, William
- Llewelyn, Haf
- Lloyd, David Myrddin
- Lloyd, David Tecwyn
- Lloyd, Isaac Samuel
- Lloyd, John
- Lloyd, John Davies Knatchbull
- Lloyd, John Edward
- Lloyd, John Morgan
- Lloyd-Johnes, Herbert Johnes
- Lloyd-Morgan, Ceridwen
- Llwyd, Alan
- Llywelyn-Williams, Alun
- Looker, Ray
- Lord, Peter
- Lumley, Gwilym Ivor
- Lyons, Stephen
- Löffler, Marion