

| Laborers | sidore the Farmer, James the Greater |
| Labour, Italian Knights of | Benedict, Abbot |
| Lacemakers | Luke |
| Lame, the | Giles |
| Landulph, Cornwall | Cybi |
| Langres cathedral | Marcellus |
| Lanhydroc, Cornwall | Hydroc |
| Latin America | Our Lady of Guadalupe, Rose of Lima |
| Latin American bishops | Turibius |
| Law, schools or faculties of | Raymond of Peñafort |
| Lawyers | Thomas More, Yves, Raymond of Peñafort, Ivo of Kermartin |
| Lay Apostolate | Paul, Apostle |
| Leaping | Venantius |
| Learning | Ambrose, Catherine of Alexandria |
| Leatherworkers | Crispin and Crispinian |
| Lecce, Italy | Bernadine Realino |
| Lecturers | Justin Martyr |
| Lennox, Scotland | Kessog |
| Lens, France | Wulganus |
| Lepers | Giles |
| Lesotho | Immaculate Heart of Mary |
| Librarians, libraries | Jerome, Catherine of Alexandria |
| Liege, Belgium | Hubert of Liege |
| Lighthouse keepers | Venerius |
| Lightning, protection against | Magnus of Fussen, Vitus |
| Limerick, Ireland | Munchin |
| Linz, Austria | Florian |
| Lithuania | Casimir, Cunegund, Hyacinth |
| Living Rosary | Philomena |
| Llanbrothen, Wales | Brothen |
| Llandunwyd, Glamorgan | Donat |
| Llangibby, Monmouthshire, Wales | Cybi |
| Llangybi, Cardigan, Wales | Cybi |
| Llanover, Gwent, Wales | Gorfor |
| Llanrhyddlad, Anglesey, Wales | Rhuddlad |
| Loc-Har, Brittany, France | Hernan |
| Lorraine | Nicholas of Myra |
| Lost articles | Anthony of Padua |
| Lost or desperate causes | Jude |
| Louisiana, USA | Our Lady of Prompt Succor |
| Lourdes | Bernadette of Lourdes |
| Lovers | Valentine |
| Lugo, Spain | Foillan |
| Luxembourg | Mary, Comforter of the Afflicted |
| Léon, Spain | Foillan |
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