Encyclopedias, Almanacs, Transcripts, and Maps
- Conrad II (ruler of the Holy Roman Empire)
- Conrad III (ruler of the Holy Roman Empire)
- Conrad the Red
- Conrad von Hötzendorf, Franz, Graf
- Conrad, Michael Georg
- Conradin
- Conroe
- Conscience, Hendrik
- conservation of wildlife
- Conshohocken
- Constans I
- Constans II
- Constant, Paul Henri Benjamin, baron d'Estournelles de
- Constantine IV (Byzantine emperor)
- Constantine Nikolayevich
- Constantine V (Byzantine emperor)
- Constantine VI (Byzantine emperor)
- Constantine VII (Byzantine emperor)
- Constantine, Learie
- Constantinople, Fourth Council of