Rajendra Lahiri (1901–1927), full name Rajendra Nath Lahiri, was an Indian revolutionary, who was the mastermind behind Kakori conspiracy and Dakshineshwar bombing. He was active member of Hindustan Republican Association aimed at ousting the British from India.
Rajendra Lahiri was born in 1901 in the village of Lahiri Mohanpur in a Brahman family of Pabna District, Bengal Presidency (now in Bangladesh). His father, Kshitish Mohan Lahiri, owned a large estate there.
He was Mastermind behind the Kakori train robbery on 9 August 1925. He was arrested and tried in the previous bomb case of Dakshineswar in Bengal and sent to jail for 10 years rigorous imprisonment. When the legal proceedings started in Lucknow for the train robbery, he was also included in the Kakori conspiracy case and tried with several other revolutionaries.
He was found guilty after a long trial and was hanged in the Gonda district jail on 17 December 1927, two days before the scheduled date, along with Thakur Roshan Singh, Ashfaq Ullah & Ram Prasad Bismil.