The Brookings Institution, often stylized as Brookings, is an American think tank that conducts research and education in the social sciences, primarily in economics (and tax policy), metropolitan policy, governance, foreign policy, global economy, and economic development. Brookings states that its staff "represent diverse points of view" and describes itself as nonpartisan. Media outlets have variously described Brookings as centrist, conservative, liberal, center-right, and center-left. An academic analysis of congressional records from 1993 to 2002 found that Brookings was cited by conservative politicians almost as often as by liberal politicians, earning a score of 53 on a 1–100 scale (with 100 representing the most liberal score). The same study found Brookings to be the most frequently cited think tank by U.S. media and politicians.

The University of Pennsylvania's Global Go To Think Tank Index Report named Brookings "Think Tank of the Year - Top Think Tank in the World" every year from its first edition in 2008 through 2015, and again from 2017 through its last edition in 2020. As of 2025, Brookings is the most cited think tank in the world.

Brookings was founded in 1916 as the Institute for Government Research (IGR), with the mission of becoming "the first private organization devoted to analyzing public policy issues at the national level." The organization was founded on March 13, 1916, and began operations on October 1, 1916.

Its stated mission is to "provide innovative and practical recommendations that advance three broad goals: strengthen American democracy; foster the economic and social welfare, security, and opportunity of all Americans; and secure a more open, safe, prosperous, and cooperative international system."

The Institution's founder, philanthropist Robert S. Brookings (1850–1932), originally created three organizations: the Institute for Government Research, the Institute of Economics with funds from the Carnegie Corporation, and the Robert Brookings Graduate School affiliated with Washington University in St. Louis. The three were merged into the Brookings Institution on December 8, 1927.

During the Great Depression, economists at Brookings embarked on a large-scale study commissioned by President Franklin D. Roosevelt to understand its underlying causes. Brookings's first president, Harold G. Moulton, and other Brookings scholars later led an effort to oppose Roosevelt's National Recovery Administration because they thought it impeded economic recovery.

With the U.S. entry into World War II in 1941, Brookings researchers turned their attention to aiding the administration with a series of studies on mobilization. In 1948, Brookings was asked to submit a plan for administering the European Recovery Program. The resulting organization scheme assured that the Marshall Plan was run carefully and on a businesslike basis.

In 1952, Robert Calkins succeeded Moulton as Brookings' president. He secured grants from the Rockefeller Foundation and the Ford Foundation and reorganized Brookings around the Economic Studies, Government Studies, and Foreign Policy Programs. In 1957, Brookings moved from Jackson Avenue to a new research center near Dupont Circle in Washington, D.C.