The 940s decade ran from January 1, 940, to December 31, 949.
Significant people
- Al-Radi Abbasid caliph
- Abd al-Rahman III caliph of Córdoba
- Constantine VII of Byzantium
- Al-Muttaqi caliph of Baghdad
- Al-Mustakfi caliph of Baghdad
- Al-Qa'im of Fatimid dynasty
- Al-Mansur bi-Nasr Allah of Fatimid dynasty
- Al-Muti caliph of Baghdad