Abu Saleh Tahan has been replaced with Abu Abdullah al-Shami, the Arabic-language Al-Akhbar newspaper reported.
Al-Shami is originally a Turkmen who has assumed several military positions since the establishment of the terrorist group.
Political analysts said Ahrar al-Sham is trying to boost the morale of its militants by appointing a new commander.
On Saturday, a senior commander of Ahrar al-Sham was killed in the Southern part of Idlib province.
Abu Khaled Talmanas was killed in an attack on his car in the road between Talmanas and Ma'ar Shourin in Southern Idlib province.
In late May, a notorious commander of Ahrar al-Sham was killed in the Syrian Army troops' offensives in the Northeastern part of the coastal province of Lattakia.
Ismayeel Ali Pasha known as Abi Ziya Banash was killed in a tough battle with the Syrian soldiers and popular forces near Tal al-Hadada.
The Syrian army has been engaged in heavy fighting with the terrorists in the Northeastern part of Lattakia, mainly in Tal al-Hadada, Rabi'eh and Salma to root out militancy in the region.
Comment: Interesting development. Either Ahrar al-Sham is getting the hint from the Russians ("separate from Nusra or die"), or their American handlers have sent the same message. Either way, it shows that something is up, and the dynamics between the various jihadi groups are getting shaken up.