Several hundred opposition leaders and supporters gathered Saturday evening in downtown Podgorica, the capital, and tried to advance through a police cordon. Officers fired tear gas and pushed them away.
Anti-government leaders had staged a days-long protest in a main street in Podgorica, but police removed their tents earlier on Saturday. Opposition parties have vowed to gather again in a bid to force an early election.
The opposition groups earlier this week also staged an anti-NATO protest during a visit by the alliance Secretary-General Jens Stoltenberg to Montenegro.
Opponents have accused Montenegro's government of authoritarian rule and pressure against opponents.