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