Fakhr al-Mulk or Fakhr ul-Mulk () is an Arabic honorific title. It can refer to:
Fakhr al-Mulk (Buyid vizier) (died 1016), vizier of the Buyid emir Baha al-Dawla Abu Shuja Muhammad al-Ashraf (died 1073), Fatimid vizier, son of the previous Fakhr al-Mulk (Seljuk vizier) (1043–1106), vizier of the Seljuk rulers Berkyaruq and Ahmad Sanjar Fakhr al-Mulk Ridwan (1077–1103), Seljuk ruler of Aleppo Fakhr al-Mulk ibn Ammar (died 1118/9), last ruling qadi of Tripoli
See also Fakhr al-Dawla Fakhr al-Din