Gambhir and his wife voted at a polling station in Old Rajendra Nagar area.
He is pitted against Congress's Arvinder Singh Lovely and Aam Aadmi Party's Atishi in a triangular contest.
All seven Delhi Lok Sabha seats are polling on the day. The BJP had won all the seats from the national capital in the 2014 Lok Sabha polls.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)