The 44-year-old Ali Al-Hadi Al-Ashiq is the latest fatality for the Shiite group that has fought alongside Syrian government forces since 2012.
Hezbollah said on Wednesday that he was killed fighting ISIS in the central desert of Palmyra on Monday.
The resistance movement has played a critical role in the Syrian military’s counter-terrorism operations over the past few years.
ISIS elements have lately retreated from much of the territory under their control amid sweeping advances by Syrian government forces on the battlefield.
On Friday, Syrian troops, backed by allied forces, foiled an ISIS attempt to wrest control of a strategic road connecting Palmyra to the eastern city of Dayr al-Zawr.
“The Syrian army and its allies completely secured the Dayr al-Zawr-Palmyra highway after foiling the intense attack,” a Hezbollah media unit said.