Before filing the nominations, Singh offered prayers at the Hanuman Setu temple and addressed party workers at the BJP state headquarters situated at Hazrathang Chauraha.
He also held a 6-kilometre-long road show in the region to the collector's office for filing nomination.
This will be the second time that the 67-year-old leader will contest Lok Sabha elections from Lucknow. In 2014, he bagged the seat by defeating the then Congress candidate Rita Bahuguna Joshi, who is now in BJP and a minister in the Uttar Pradesh government.
Lok Sabha elections in Lucknow will be held on May 6 and the counting of the votes will take place on May 23.
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