The term "Intelligence Bureau" refers to two different organizations: one in India and one in the United States.

Intelligence Bureau in India The Intelligence Bureau (IB) is Indias internal security and counter-intelligence agency under the Ministry of Home Affairs. It was founded in 1887 as Central Special Branch and is reputed to be the oldest such organization in the world). The IB is used to gather intelligence from within India and also execute counter-intelligence and counter-terrorism tasks. The Bureau comprises employees from law enforcement agencies, mostly from the Indian Police Service (IPS) or the Indian Revenue Service (IRS) and the military. However, the Director of Intelligence Bureau (DIB) has always been an IPS officer). Due to the extreme secrecy surrounding the agency, there is little concrete information available about it or its activities).

Bureau of Intelligence and Research in the United States The Bureau of Intelligence and Research (INR) is a bureau of the United States Department of State and a member of the Intelligence Community (IC). INR delivers and coordinates timely, objective intelligence that advances U.S. diplomacy. INR is the only U.S. intelligence organization whose primary responsibility is to provide intelligence to inform diplomacy and support U.S. diplomats. INR provides intelligence assessments and other information for the President, the National Security Council, and other senior policymakers. Each week INR delivers dozens of intelligence assessments, products, and briefings to diplomats and policymakers at home and abroad.

In summary, the Intelligence Bureau is Indias internal security and counter-intelligence agency, while the Bureau of Intelligence and Research is a bureau of the United States Department of State and a member of the Intelligence Community that provides intelligence to inform diplomacy and support U.S. diplomats.