"The international community must intervene immediately to ensure that civilians are protected," said parliamentary member Abu Bakr Biira.
Violence between depleted government forces and Islamist militant gangs has escalated in Libya in recent weeks. The surge of violence in and around the capital forced many embassies and international organizations to shutter.
Parliament convened Wednesday in Tobruk instead of Tripoli because of the unrest, with 111 of 124 parliamentarians voting in favor of international intervention.
It is unclear what form of intervention the parliament is seeking.
The U.N. Support Mission in Libya issued a statement of its own Wednesday, noting that it "continues to make efforts with the parties to reach a cease-fire and embark on a dialogue to coordinate this cease-fire by political means."
Led by the U.N. secretary-general's deputy special representative for Libya and deputy head of UNSMIL, Ould Cheikh Ahmed, the delegation is promoting a political resolution for the conflict-ridden country.
UNSMIL stated Wednesday that "Naturally, the Mission's view is that these solutions cannot be imposed by force," perhaps a response to parliament's vote in favor of international intervention.