He has transformed Fidesz from a liberal party formed in the 1980s to a right-wing populist outfit, which has campaigned this election on an anti-immigration platform.
The nationalist leader's Fidesz party enjoys opinion poll leads of between 20 and 30 percentage points over its closest rival Jobbik, a far-right party led by Gabor Vona that has been moving towards the centre, and the leftist Socialists with their candidate Gergely Karacsony. His critics said his stance has fuelled xenophobia in Hungary.
Winning another two-thirds majority would give Orban the chance to boost a new class of politically-connected oligarchs, tighten his grip on institutions such as the courts, and strengthen resistance against countries like France and Germany that are seeking to deepen European Union integration.
Voter turnout in the first hours of voting in Hungary's election is the highest since 1998.
"We are convinced that high turnout definitely reflects. that people want a change in government", Socialist spokeswoman Bernadett Budai was quoted as saying by national news agency MTI.
Hungarian election officials say voter turnout in the country's parliamentary election 90 minutes before polls close has already exceeded the total turnout for the 2014 elections.
"This is one of the most unpredictable elections", said Attila Juhasz, an analyst at Political Capital in Budapest.
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Heartened by a recent poll showing more Hungarians would prefer for Orban to go than to stay, the opposition has shifted its focus from coordination to get-out-the-vote campaigns.
The anti-immigrant campaign has gone down well with numerous roughly two million core voters of Fidesz.
'We are celebrating democracy and it seems like this feast will be attractive because many of us are taking part, ' said Gergely Karacsony, the leading candidate of the left-wing Socialist and Dialogue parties.
Gabor Vona of the nationalist Jobbik party urged his supporters not to become complacent.
Orban, that voted with his wife at a Budapest faculty in their home, informed a crowd of colleagues that he will "honor the decision" of the Hungarian voters.
All 199 seats in the Hungarian parliament are up for grabs, with the opposition keen to make sure Mr Orban's bloc does not win a super-majority which would allow the autocratic leader to push through further constitutional changes.
A mainly first-past-the-post election system designed by Fidesz after it came to power gives it an advantage over the fragmented opposition parties. He claims the European Union, the U.N., Hungarian-American financier George Soros and the civic groups he sponsors are all conspiring to force Hungary to take in thousands of mainly Muslim migrants to weaken its independence and its Christian identity and culture.