The Second Fitna, or Second Islamic Civil War, is a period of general political and military disorder that afflicts the Islamic empire during the early Umayyad dynasty, following the death of the first Umayyad caliph Muawiyah I.

There seems to be a lack of solid consensus on the exact range of years that define the conflict, with several different historians dating the Second Fitna differently.

Some see the end of Muawiya's reign in 680 CE as marking the beginning of the period, while the year 683 (following the death of Muawiya's son the Caliph Yazid I) is cited by others.

Similarly, the end is variously dated from 685 (after the ascension of Caliph Abd al-Malik ibn Marwan) to 692 (following the death of Ibn al-Zubair and the termination of his revolt).

The dates 683-685 seem to be the most commonly used.