With Nationalist Democratic People's Party(NDPP) chief Neiphiu Rio winning unopposed the Northern Angami-II seat, polling is being held in 59 seats.
Voting will continue till 4 pm, except in some polling stations of the interior districts where it will end at 3 pm, election office sources said.
Officials said many as 281 companies of the Central Armed Police Forces (CAPF), beside the state police force have been deployed throughout Nagaland to ensure peaceful polling.
All the polling stations would be manned by the CAPF personnel and the state police would also be assisting them, he added.
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A total of 11,76,432 voters, comprising of 5,97,281 male, 5,79,151 female and 5884 service voters, are eligible to exercise their franchise during the day to decide the fate of 195 candidates.
There are no third-gender voters in the state while the first time voters between the age group 18-19 years are 26,900, Assistant Chief Electoral Officer, Awa Lorin said today.
Out of the 2156 polling stations, 1062 are critical, 530 vulnerable and 564 normal polling stations, he said.
Over 15,000 government employees will be on poll duty and there will be 177 all-women polling stations across 25 constituencies in the state.
Sinha said there are 55 election observers, include 22 general and expenditure observers each and 11 police observers, besides 442 mirco observers.
Electronic voting machines with Voter Verifiable Paper Audit Trail machines will be used for voting, he added.
Following this no-election diktat the political parties had initially kept away from the poll process and the first batch of 22 contestants filed their candidature only on the penultimate day on February 5, though filing of nominations had begun on January 31.
There was a heavy rush of nominees filing their papers on the last day.
BJP, which is determined to expand its foot print in the northeast this time after Assam, Manipur and Arunachal Pradesh, is relying on its partner, the NDPP.
The Congress, which has given three chief ministers to Nagaland since the state's inception in 1963, is contesting from only 18 seats - two less than the BJP.
The results of the polls in Nagaland will be declared along with those of Tripura and Meghalaya on March 3.