Sa'id ibn Khalid ibn Muhammad ibn Abd Allah ibn Amr ibn Uthman ibn Affan al-Uthmani (Arabic: سعيد بن خالد بن محمد بن عبد الله بن عمرو بن عثمان بن عفان, fl. 813 CE), commonly known as al-Faddayni (الفديني), was a member of the Umayyad family who led a failed revolt against the Abbasid Caliphate in the Hauran and Balqa (Transjordan) in 813, during the Fourth Muslim Civil War, in a bid to claim the caliphate. His revolt followed two other abortive revolts by Umayyad claimants to the caliphate in Damascus, those of Abu al-Umaytir al-Sufyani and Maslama ibn Ya'qub. In effect, al-Faddayni's rebellion was the last major attempt to resurrect the Umayyad Caliphate in Syria.