Around 47 per cent voting was registered in the Rajouri Garden assembly by-poll in Delhi on Sunday, officials said.
In the 2015 assembly elections, when the Aam Aadmi Party swept to power, the constituency had witnessed 72 per cent.
AAP's Harjeet Singh, Congress' Meenakshi Chandela and BJP-SAD's Manjinder Singh Sirsa are in the fray for the seat.