F
| Faculties of law | Raymond of Peņafort |
| Fahan, Ireland | Mura McFeredach |
| Fainting, faintness | Urban of Langres, Ursus of Ravenna, Valentine |
| Faith in the Blessed Sacrament | Anthony of Padua |
| Falling | Venantius |
| Falsely accused | Raymond Nonnatus |
| Families | Francis of Assisi, Joseph, Maximillian Kolbe |
| Family happiness or harmony | Dymphna, Ksenya Blazhennaya |
| Family life | Infant Jesus of Prague |
| Farm labourers (Spain, Canada, Mexico) | Isidore the Farmer |
| Farm workers | Benedict, Abbot |
| Farmers | Isidore the Farmer |
| Farmers, Italian | Benedict, Abbot |
| Farriers, horseshoe makers | Eligius (Eloi), John the Baptist |
| Fathers | Joseph |
| Fear of insects | Gratus of Aosta |
| Fear of mice or rats | Gertrude of Nivelles |
| Fear of night | Giles |
| Fear of snakes | Patrick |
| Fear of the Lord | Holy Spirit |
| Fear of wasps | Friard |
| Fencing | Michael the Archangel |
| Ferrara, Italy | George |
| Ferrymen | Julian the Hospitaller |
| Fervent First Communion | Bl Imelda |
| Fever | Genevieve (Genofeva) |
| Fiddlers, fiddle players | Julian the Hospitaller |
| File makers | Theodosius the Cenobriarch |
| Final perseverance | Alphonsus de Liguori |
| Financial officers | Matthew the Apostle |
| Finland | Henry of Finland |
| Fire (danger from) | Agatha, Nicholas of Tolentino |
| Fire fighters | Florian, John of God |
| Fire prevention | Catherine of Siena, Agatha |
| Firemen (Italian) | Barbara |
| Fireworks and Fireworks manufacturers | Barbara |
| First Communicants | Tarcisius |
| Fish | Neot |
| Fish dealers, Fishmongers | Andrew, Apostle, Assumption of the Blessed Virgin, Magnus, Nativity of the Blessed Virgin |
| Fishermen | Andrew, Apostle, Peter |
| Fistula | Fiacre |
| Fleury-sur-Loire | Drogo |
| Fliers | Our Lady of Loreto |
| Flight attendants | Bona |
| Flight crew | Our Lady of Loreto |
| Flood | Gregory the Wonderworker, Florian |
| Florence, Italy | John the Baptist, Zenobius |
| Florentine cheese merchants | Bartholomew the Apostle |
| Florentine salt merchants | Bartholomew the Apostle |
| Florida | Our Lady of La Leche |
| Florists, flower growers | Therese of Lisieux, Rose of Lima, Bl. Rose of Viterbo |
| Flour merchants | Honorius of Amiens |
| Flying | Joseph of Cupertino, Elijah |
| Flying, all involved in | Our Lady of Loreto |
| Foot problems; feet problems | Peter the Apostle, Servatus |
| For good weather | Agricola of Avignon, Clare of Assisi, Medard of Noyon |
| For rain | Agricola of Avignon, Eulalia, Heribert of Cologne, Isidore the Farmer, Julian of Cuenca, Odo, Theodore of Sykeon |
| Foreign missions | Francis Xavier, Infant Jesus of Prague, Peter Claver, Therese of Lisieux |
| Foresters | John Gualbert |
| Forgotten people | Jeanne de Chantal |
| Forli, Italy | James Salomone |
| Fortifications | Barbara |
| Fortitude | Holy Spirit |
| Fosses, Belgium | Foillan |
| Founders | Barbara |
| Foundlings | Holy Innocents |
| Fragalata, Sicily | Calogerus, Demetrius, Gregory |
| France | Joan of Arc, Laurent (Lawrence), Mary, on feast of her Assumption, Bishop of Paris, Therese of Lisieux |
| Franciscan laity | Didacus |
| Franciscan Lay | Didacus |
| Franciscan tertiaries | Louis |
| Freedom | Infant Jesus of Prague |
| French Commissariat | Ambrose of Milan |
| French monarchs | Louis IX |
| Friendships | John the Apostle |
| Fruit dealers | Christopher |
| Fugitives | Bridgid of Ireland |
| Fullers | Anastasius the Fuller, Christopher, James the Lesser, Apostle |
| Funeral directors | Joseph of Arimathea |
| Furriers | Hubert of Liege, James the Greater |