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Abu 'l-Abbas Muhammad ibn Ja'far al-Muqtadir (Arabic: أبو العباس محمد بن جعفر المقتدر) (December 909 – 23 December 940), usually simply known by his regnal name al-Radi bi-llah (Arabic: الراضي بالله, "Content with God"), was the 20th Abbasid Caliph, reigning (rather than ruling) in Baghdad from 934 to his death. He died on 23 December 940 at the age of 31.