Agnus (Latin for lamb) can be used to refer to :
People with the surname Felix Agnus (1839-1925), American military officer and newspaper publisher
Religion Agnus Dei (Latin: "Lamb of God") referring to Jesus Christ as divine sacrificial lamb an early prayer of the breviary
Places and jurisdictions Agnus (Egypt), an Ancient city and former bishopric in Aegyptus Primus, now a Latin Catholic titular see Agnus (Attica), a deme of ancient Attica
Biology Agnus scythicus, Latin for Vegetable Lamb of Tartary, a mythologic lamb-plant Agnus (beetle), a stag beetle genus
Technology MOS Technology Agnus, an integrated circuit in the OCS chipset of the Commodore Amiga computer
In popular culture Agnus, one of the antagonistic factions in Xenoblade Chronicles 3.
Other Asymmetric Gait Nail Unit Syndrome (AGNUS), a form of onycholysis (detachment of the nail)