The parliamentary vote is the first in the small former Yugoslav republic since Milo Djukanovic, former leader of the Democratic Party of Socialists (DPS), lost the presidential election in April and stepped down after 30 years in power.
Polling stations for the 540,000-strong electorate open at 7 a.m. (0500 GMT) and close at 8 p.m. (1800 GMT).
The state election commission said 15 parties and alliances will compete for 81 parliamentary seats in the nation of just over 620,000 people.
Montenegro is a candidate to join the EU, but it must first root out corruption, nepotism and organised crime.
After Russia's invasion of Ukraine last year, Montenegro - unlike Serbia - joined EU sanctions against Moscow.
Persons:
Djukanovic, Milo Djukanovic, Jakov Milatovic, Milojko Spajic, Danijel Zivkovic, Zivkovic, Moscow, Aleksandar Vasovic, Stevo, Helen Popper Our
Organizations:
PODGORICA, NATO, European Union, Democratic Party of Socialists, Centre for Democracy, Human, European, Finance, EU DPS, Russia Democratic Front, Serbian Orthodox, EU, Serbian, Moscow, Thomson
Locations:
Yugoslav, EU, Montenegro, Serbia, Serbian, Ukraine, Belgrade, Podgorica