Cicero (106–43 BC), full name Marcus Tullius Cicero, was a Roman statesman, lawyer, political theorist, philosopher and one of Rome's greatest orators.

Cicero may also refer to:

• Cicero, Illinois
  • Cicero Avenue, a north–south street
  • Cicero (CTA Blue Line station)
  • Cicero (CTA Pink Line station)
  • Cicero (CTA Green Line station)
  • Cicero station (Metra)
• Cicero, Indiana
• Cicero, Kansas
• Cicero, New York
• Cicero, Ohio
• Cicero, Wisconsin, a town
  • Cicero (community), Wisconsin, an unincorporated community

• Cicero (1796 ship), a West Indiaman and whaler
• Cicero (1819 ship), a whaler
• HMS Cicero (F170), a Second World War infantry landing ship
• HMS Cicero (1918), a 24-class minesweeping sloop

• Cicero (horse), a racehorse owned by Archibald Primrose, 5th Earl of Rosebery
• Cicero (magazine), a German political magazine
• Cicero (typography), a unit of measure in typesetting used in France and several other countries
• 9446 Cicero, a Main-Belt asteroid
• Cicero: The Philosophy of a Roman Sceptic, 2015 book by Raphael Woolf
• Cicero Stadium, a sports stadium in Asmara, Eritrea
• Centre for International Climate and Environmental Research, a research centre in Oslo, Norway

• Andrea Lo Cicero (born 1976), Italian rugby player
• Chic Cicero (born 1936), founder and co-Chief of the modern Hermetic Order of the Golden Dawn
• David Cicero (born 1970), Scottish singer and keyboardist
• Nando Cicero (1931–1995), Italian director and actor
• Padre Cícero (1844–1934), pr Cícero Romão Batista, Brazilian priest
• Roger Cicero (1970–2016), German singer
• Tabatha Cicero, co-chief of the modern Hermetic Order of the Golden Dawn

• Cicero Minor (born 65 BC), son of Marcus Tullius Cicero and Roman consul
• Cícero Ramalho (born 1964), Brazilian footballer
• Cícero Santos (born 1984), Brazilian footballer
• Cícero Semedo (born 1986), Portuguese footballer

• Quintus Tullius Cicero (died 43 BC), younger brother of Marcus Tullius Cicero who served in government as an author
• Cicero, code name for Elyesa Bazna (1904–1970), Albanian secret agent for Germany during World War II

• Marcus Tullius Cicero (Rome character)
• Paul Cicero, in the film Goodfellas
• Cicero Pig, in Porky Pig films
• Cicero, in the film Gladiator
• Cicero, in the comic strip Mutt and Jeff
• Cicero, in the video game The Elder Scrolls V: Skyrim

• Cicerone (disambiguation)
• Cicinho or Little Cicero (born 1980), or, Brazilian footballer
• Commonwealth Scientific and Industrial Research Organisation
• List of ships named Cicero