Hernán Büchi Buc (born March 6, 1949) is a Chilean economist and politician. He served as Minister of the Treasury under the government of Augusto Pinochet between 1985 and 1989.

After the recession of the early 1980s, Büchi's appointment as Finance Minister in 1985:

...marked the beginning of economic recovery. Büchi's strategy was to create the financial conditions for stable, export-led growth and to reorganize the productive structures of the export sector. Control of public spending, periodic devaluations, and incentives for domestic savings, foreign investment and the repatriation of capital gradually brought inflation down to 12 per cent by 1989, the lowest rate in Latin America. A vigorous campaign to sell parcels of the public debt to private investors in exchange for shares in Chilean industries reduced the nation's debt burden by over $4 billion...Economic growth averaged between 5 per cent and 6 per cent in 1985-8, the highest rate in the region.

In the 1989 Chilean presidential election Büchi stood for the centre-right Democracy and Progress Party. Büchi's campaign hired a former public relations adviser to former British Prime Minister Margaret Thatcher, Timothy Bell. Büchi came second with 2,051,975 votes (29.40%). However he "received more support from women than men in 59 of the 60 electoral districts, the exception being in southernmost district of Magallanes, where his support was about equal between the sexes".