Campanus can refer to:

• Johannes Campanus (Giovanni Campano) (1220-1296) was an Italian astrologer, astronomer, and mathematician.
• An astrological house system, which is named after Johannes Campanus.
• Campanus crater, also named after Johannes Campanus.
• Johann Campanus, a Belgian Anabaptist religious reformer of the sixteenth century.
• Johannes Vodnianus Campanus (Jan Vodňanský Campanus; Jan z Vodňan, Jan Campanus-Vodňanský, Jan Kampánus Vodňanský, Ionnes Campanus Vodnianus) (1572-1622), Czech humanist, composer, pedagogue, poet, and dramatist.
• Campanus is a Latin word meaning of or pertaining to the Italian region of Campania.