- Acanthus (Lat. Acanthus Gk. Akantha, "Thorn")
- Aedicula
- Aerial Perspective
- Alb (Lat. Alba Tunica, "White Garment")
- All' Antica (It. "From The Antique")
- Allegory (Gk. Allegorein, "Say Differently")
- Altarpiece
- Anamorphosis
- Anghiari, Battle Of
- Annunciation
- Antique, Classical World (Lat. Antiquus, "Old")
- Antwerp Mannerists
- Apelles (C. 330 Bc)
- Apocalypse (Gk. Apokalyptein, "Reveal")
- Apocalyptic Madonna
- Apocrypha (Gk. Apokryphos, "Hidden")
- Apostle (Gk. Apostolos, "Messenger")
- Applied Art
- Apse (Lat. Absis, "Arch, Vault")
- Aquatint
| - Arcade (Lat. Arcus, "Arch")
- Arcadia
- Arch
- Architectonic (Gk. Arkhitektonikos, "Architectural")
- Architrave (It. "Chiefbeam")
- Archivolt (Ital. Archivolto, "Front Arch," From Gk. Archeiu, "Begin, Dominate," And Lat. Voltus, "Turned")
- Ars Moriendi (Lat. "The Art Of Dying Well")
- Attribute (Lat. Attributum, "Added")
- Augsburg Confession
- Aureole (Lat. Aureolus, "Golden, Beautiful")
- Autobiography
- Avignon
- Bacchus
- Baldachin, Or Baldacchino (It. "Brocade")
- Balustrade
- Bambocciati
- Banderole (It. Banderuola, "Small Flag")
- Baptistery
- Baroque (Port. Barocco, "An Irregular Pearl Or Stone")
- Barrel Vault
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