Rab Thalathin (Arabic: رب ثلاثين) is a municipality in the Marjayoun District in southern Lebanon.

[2] In 1881, the PEF's Survey of Western Palestine (SWP) found here "several lintels and cisterns.

According to Human Rights Watch there were no indications that Hezbollah fighters were present at the time of the strikes.

[5] In October 2024 the IDF claimed to have blown up a large underground complex at Rab Thalathin, said to have been in construction for a decade or more.

The complex - the IDF claimed - was ready to host 200 Hezbollah militants, and included computerized communications control rooms, supplies for months, ammunition on a battalion scale, RPGs, long-range anti-tank missiles, charges of various sizes, hundreds of rifles, and other tactical equipment.