- Abbas I
- Abbasid
- Abbott, Sir John
- Abd el‐Krim
- Abdication crisis
- Abdul Hamid II
- Abdul Rahman, Tunku
- Abdullah ibn Hussein
- Abdullah II
- Abdullah, Sheikh Muhammad
- Abd‐al Aziz ibn Saud
- Abelard, Peter
- Aberdeen, George Hamilton Gordon, 4th Earl of
- abolition of slavery
- abolitionists
- Aborigine
- Aboukir Bay
- Abraham, Plains of
- Absaroke
- absentee landlord
- Abu Bakr
- Abushiri Revolt
- Abydos
- Abyssinia
- Abyssinian Campaigns
- Academy
- Achaean League
- Achaemenid
- Acheh War
- Acheson, Dean