The scheme will be available in Delhi NCR, Haryana and Kerala, which are going to polls tomorrow, from 7 am to 7 pm.
Airtel said the idea behind the initiative is that it wants to give customers an option to go online and read about candidates before casting their votes.
"As India gears up for general Lok Sabha elections 2014, Bharti Airtel is encouraging voters to make an informed choice of candidates by offering 50 MB of free data usage for its prepaid mobile customers on the polling day from 7am to 7pm," the company said in a statement.
There are 150 candidates in fray in Delhi for the Lok Sabha polls.
At the end of February, Airtel had over 1 crore users in Delhi-NCR, 23.68 lakh in Haryana and 36.99 lakh in Kerala. On an average, 95 per cent of the users are pre-paid.
"Customers voting can also leverage this free data to post pictures of their inked fingers on social networks and inspire their friends as well as family to exercise their voting rights too," the company said.