Cosi, COSI or CoSi may refer to: * '' Così'', a 1992 play by Louis Nowra ** ''Cosi'' (film), 1996, based on the play * Così (restaurant), an American fast-casual restaurant chain * Compton Spectrometer and Imager, or COSI, a NASA telescope to be launched in 2025 * COSI (Center of Science and Industry), a science museum and research center in Columbus, Ohio, U.S. * COSI Toledo, now Imagination Station, a science museum in Toledo, Ohio, U.S. * Cobalt monosilicide, a material with the chemical formula CoSi * Julián Cosi (born 1998), an Argentine footballer * Valerio Cosi (born 1985), an Italian musician

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