Polling stations opened at 7:00 a.m. local time (0400 GMT) on Sunday and will close at 7:00 p.m. local time (1600 GMT).
It’s the first time the Lebanese are voting for a parliament in nine years. It is also the first time elections are being held since neighboring Syria’s war began in 2011.
The vote has been postponed a number of times over security concerns it would ignite tensions among Lebanon’s sects, already heightened by that war.
The 128-parliamentary seats are split evenly - 64 for Christians and 64 for Muslims including Druze, with the two halves further divided among 11 religious groups.
Each of the 15 electoral districts has parliamentary seats apportioned according to its demographic make-up.
Official results of parliamentary elections are not expected until Monday or Tuesday.