"Syria will triumph and the resistance axis will triumph," Nasrallah said in a televised address to mark the 14th anniversary of Israel's withdrawal from south Lebanon.
Hezbollah has sent thousands of fighters into Syria to support President Bashar al-Assad's forces against rebels, saying they are defending an "axis of resistance" against Israel and the West.
Nasrallah's speech came two weeks ahead of a presidential vote in Syria that is widely expected to return Assad to power.
The exiled opposition and its Western backers, who have held several international meetings under a 'Friends of Syria' umbrella, have ridiculed the June 3 vote as a "farce".
Syria's civil war raging since March 2011 has killed more than 160,000 people and forced nearly half the population to flee their homes.
More than a million Syrians have taken refuge in neighbouring Lebanon, which has been sharply divided into pro- and anti-Assad camps.
Syria dominated Lebanon for 30 years until 2005, but continues to exert influence over the tiny Mediterranean country through its allies.
Hezbollah, Nasrallah said, is still able to deter its arch-enemy Israel, against which it fought a 33-day war in 2006 that killed 1,200 Lebanese, mostly civilians, and 160 Israelis, mostly soldiers.
"Despite the developments and events that are taking place in our region, especially in Syria, the resistance (Hezbollah) still has the capacity to deter Israel," he said.
"This is one of the Israeli enemy's concerns. It looks at Syria and Iran (key Assad and Hezbollah backer)... And sees that they are giving all the help they can to the resistance," he said, suggesting Hezbollah is still receiving military and financial support from its allies.
"Should we reach the point where the resistance must respond, the resistance will not be silent," he said.
His televised speech was followed by a massive crowd that gathered in the southern Lebanese town of Bint Jbeil.
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