F
- Faith in Christianity
- Felix of Byzantium
- Fellowship of Congregational Churches
- Fellowship of Evangelical Baptist Churches in Canada
- Fellowship of Grace Brethren Churches
- Fellowship of Independent Evangelical Churches
- First Council of Constantinople
- First Council of Nicaea
- First Epistle of John
- First Epistle of Peter
- First Epistle to the Corinthians
- First Epistle to the Thessalonians
- First Epistle to Timothy
- First Great Awakening
- First seven Ecumenical Councils
- First Vatican Council
- Five solae
- Flagellation of Christ
- Four Evangelists
- Four Horsemen of the Apocalypse
- Fourth Council of the Lateran
- Fourth Great Awakening
- Foxe's Book of Martyrs
- Francis of Assisi
- Francis Xavier
- Free Church of England
- Free Church of Scotland (Continuing)
- Free Church of Scotland (since 1900)
- Free Methodist
- Free Methodist Church
- Free Methodist Church in Canada
- Free Presbyterian Church of Scotland
- Free Presbyterian Church of Ulster
- Friar
- Friends General Conference
- Friends United Meeting
- Friends World Committee for Consultation