The missile struck an orchard in the community of Margaliot on Monday, hitting eight Indian workers, Israel's Channel 12 TV news reported.
Israel's rescue service of Magen David Adom said in a statement that two were seriously injured and others had moderate to light wounds. They were evacuated with Air Force helicopters to hospitals.
The Israeli army responded by launching tank and artillery fire toward the source of the missile attack, according to an Israeli military spokesperson.
The violence was the latest in 150 days of fighting across the Israel-Lebanon border amid the ongoing war in the Gaza Strip.