Timothy Franz Geithner (pronounced /ˈɡaɪtnər/; born August 18, 1961) is the 75th and current United States Secretary of the Treasury, serving under President Barack Obama. He was previously the president of the Federal Reserve Bank of New York.

Geithner's position includes a large role in directing the Federal Government's economic response to the financial crisis which began after December 2007. Specific tasks include directing the allocation of the $350 billion of Wall Street bailout funds. He is currently dealing with multiple high visibility issues, including the survival of the automobile industry, the restructuring of banks, financial institutions and insurance companies, recovery of the mortgage market, demands for protectionism, President Obama's tax changes, and relations with foreign governments that are dealing with similar crises.

Geithner was born in Brooklyn, New York and spent most of his childhood outside the United States, including present-day Zimbabwe, Zambia, India and Thailand where he completed high school at the International School Bangkok. He attended Dartmouth College, graduating with an A.B. in government and Asian studies in 1983. In the process he studied Mandarin at Peking University in 1981 and at Beijing Normal University in 1982. He earned an M.A. in international economics and East Asian studies from Johns Hopkins University's School of Advanced International Studies in 1985. He has studied Chinese and Japanese.