The election is seen by the West as a key democratic test for the small landlocked nation of 2.9 million, which has no history of transfers of power to an opposition through the ballot box.
But the campaign has already been marred by opposition claims that the government is preparing mass electoral fraud.
Ahead of the vote, the European Union delegation to Armenia and the US embassy said in a joint statement that they were "concerned by allegations of voter intimidation, attempts to buy votes, and the systemic use of administrative resources to aid certain competing parties."
This time, the country aims to hold an exemplary vote to elect "a parliament trusted by society," the president told AFP in an interview in March.
He said his government "has made enormous efforts so that (Sunday's) milestone vote is flawless."
The polls come after constitutional amendments initiated by Sarkisian in 2015 that his opponents say were designed to keep the ruling Republican Party in power.
The changes were passed after a referendum, but they also prompted thousands to rally in protest.
The opposition alleges that the changes were made to allow Sarkisian, 62, to maintain his grip on power by remaining party leader after he steps down as president.
"The amendments will perpetuate the rule of Sarkisian and his Republican Party," which has held onto power for two decades, said Aram Manukyan, an MP from the Armenian National Congress opposition party.
Sarkisian has denied the allegations and defended the changes as "part of Armenia's democratisation process," saying they would empower the opposition.
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