Kasarnaba (Arabic: قصرنبا) is a town in Baalbek District, Baalbek-Hermel Governorate, Lebanon famous for its hilly terrain and traditional agricultural practices.

The town is located at the shoulder of The Western Lebanese Mountain Range just to the East of Mount Sanine specifically and it overlooks the central parts of Beqaa Valley.

A Roman Temple is found in this town, called "Castra El Banaat".

In 1838, Eli Smith noted Kasarnaba's population to be predominantly Metawileh.

[citation needed] In 1994 Mustafa Dirani was abducted by Israeli forces from his home in Kasarnaba.