Hassan Nasrallah, in a televised speech, said the battle in the mountainous area was "ongoing in terms of time and place," but that Hezbollah had dealt "resounding defeats" to rebels there.
Hezbollah and the Syrian regime have "kicked out the armed groups from the battlefield, retaking control of 300 kilometres of territory," Nasrallah said.
He dismissed reports that Hezbollah had lost dozens of fighters in the battle, saying 13 had been killed.
The Qalamun region straddles the Syria-Lebanon border and was a stronghold of rebel forces until a major operation by Syrian regime troops backed by Hezbollah fighters last year.
From there, jihadists have launched attacks inside Lebanon, including in August 2014 when fighters from Al-Qaeda's Syria affiliate Al-Nusra Front and the Islamic State group briefly overran the eastern Lebanese town of Arsal.
As they withdrew from Arsal, the groups took several dozen Lebanese security forces with them as hostages and remained hidden in the town's outskirts.
"As long as the armed groups are present in Arsal's outskirts and in the remaining parts of Qalamun... We cannot talk about full security," Nasrallah said.
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