Ranendra "Ronen" Sen (born 9 April 1944) is an Indian diplomat who was India's ambassador to the United States of America from August 2004 to March 2009.

[1] Mr. Sen served as an Independent Director of Tata Motors, from 1 June 2010 till 2012.

[2] In August 2007, Sen was issued notice (and subsequently censured) by the Parliamentary Privileges Committee to explain the "headless chicken" remark he was alleged to have made in an off-the-record interview published by Rediff.com on 20, August 2007, titled: "We will have zero credibility" on the Atomic Energy Pact.

[3] The Rajya Sabha Committee said, in it report, tabled in the House:In view of Sen's acceptance of having made the impugned remarks and that the same were unwarranted, and having tendered his unconditional apology, the Committee recommends that the matter should be allowed to rest here.In its uncharacteristic[according to whom?]

censure, the Rajya Sabha panel felt his remarks were: not only in poor taste but also unwarranted... personal frame of mind should not have influenced public utterances of a senior and experienced diplomat...