Al-Wathiq () was the ninth Abbasid caliph, ruling from 842 to his death in 847.
The name can also refer to:
al-Wathiq I (died after 1341), Caliph of Mamluk Cairo in 1340–1341 al-Wathiq II (died 1386), Caliph of Mamluk Cairo in 1383–1386 Idris al-Wathiq (died 1269), last Almohad ruler in 1266–1269 Yahya II al-Wathiq (died 1279), Hafsid sultan of Ifriqiya in 1277–1279 al-Wathiq al-Mutahhar (1303–1379/80), Zaydi imam of Yemen in 1349 Muhammad ibn Ahmad al-Wathiq, Marinid sultan of Fez in 1386–1387