Rouanet is a French surname. Notable people with the surname include:
Marie Rouanet (1936–2026), French singer and writer Pierre-Eugène Rouanet (1917–2012), French Roman Catholic bishop Sam Rouanet (born 1972), French musician and DJ Sérgio Paulo Rouanet (1934–2022), Brazilian diplomat, philosopher, essayist and scholar
See also Rouanet Law, Brazilian law