Encyclopedias, Almanacs, Transcripts, and Maps
- Pitigrilli
- Pitra, Jean Baptiste
- Pitts, John
- Pittsburgh Platform
- Pittsburgh, Diocese of
- Pittum Ha-Ketoret
- Pius I, Pope, St.
- Pius II, Pope
- Pius III, Pope
- Pius IV, Pope
- Pius IX, Pope, Bl.
- Pius V, Pope, St.
- Pius VI, Pope
- Pius VII, Pope
- Pius VIII, Pope
- Pius X School of Liturgical Music
- Pius X, Pope, St.
- Pius XI, Pope
- Pius XII, Pope
- Pius XII°