Al-Wathiq (Arabic: الواثق) 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

Topics referred to by the same term

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