With just over 20 percent of constituencies reporting election results, the Civil Contract party looks set to receive over 50 percent of the vote. Pashinyan's challenger, billionaire Samvel Karapetian, looks set to receive just over 20 percent of the vote.
Nearly 2.5 million Armenians were eligible to vote in the election, which has been described as a test of the prime minister's more pro-Western policies. Voter turnout was 59 percent, according to the country's election commission.
The Kremlin has been accused of trying to influence the election through disinformation.
The vote was monitored by observers from the Organization for Security and Co-operation in Europe (OSCE). Election observers are scheduled to hold a press conference on Monday to provide information on the circumstances surrounding the election.
