Clementi may refer to:

• Aldo Clementi (1925–2011), Italian composer
• Carlo Mazzone-Clementi (1920–2000), Italian actor and mime
• Cecil Clementi (1875–1947), British colonial administrator, Governor of Hong Kong and Straits Settlements
• Cecilia Clementi, Italian-American scientist
• Cresswell Clementi (1918–1981), senior Royal Air Force commander
• David Clementi (born 1949), British business executive, deputy governor of the Bank of England, and chairman of the BBC
• Enrico Clementi (1931–2021), Italian computational chemist
• Muzio Clementi (1752–1832), Italian/English composer
• Rich Clementi, American mixed martial artist
• Suicide of Tyler Clementi, 2010 incident in which a college student committed suicide after his sexual encounter with another man was video-streamed over the internet

• Clementi, Singapore, a neighbourhood of Singapore
• Clementi MRT station, Singapore
• Clementi Police Division, a police division of the Singapore Police Force
• Clementi Public Library, a public library in Singapore
• Clementi Town Secondary School, a secondary school in Singapore
• Clementi Secondary School, a secondary school in North Point, Hong Kong
• Tyler Clementi Foundation, a anti-bullying non-profit organization