The following is a timeline of the history of the city of Reggio Emilia in the Emilia-Romagna region of Italy.

Prior to 18th century

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• 187 BCE – Via Aemilia (road) built through town.^[1]
• 77 BCE – Roman tribune Marcus Junius Brutus the Elder assassinated.^[1]
• 328 BCE – Protasio, First known Bishop of Regium (Reggio Emilia) ^[2]
• 409 BCE – Reggio sacked by Gothic
• 899 – Reggio sacked by Magyar forces.^[3]
• 924 – Reggio sacked by Magyar forces.^[3]
• 1168 – Reggio joins the Lombard League.^[4]
• May 29, 1176 – Victorious Battle of Legnano (Italian Cities allies, Lombard league, against the Emperor)

• June 25, 1183 Peace of Constance
• 1245 – Consuetudini (law) issued.^[4]
• 1289 – Obizzo II d'Este in power.^[1]
• 1409 – Este in power (until 1796).^[3]
• 1452 – Duchy of Reggio established.
• 1474 – Birth of Ludovico Ariosto, poet.^[1]
• 1480 – Printing press in operation.^[5][4]
• 1512 – Forces of Pope Julius II occupy Reggio.^[4]
• 1523 – Este rule restored.^[4]
• 1597 – Basilica della Ghiara construction begins.^[1]

18th–19th centuries

• 1741 – Teatro della cittadella (theatre) opens.^[4][6]
• 1746 – Accademia degli Ipocondriaci active.^[7]
• 1798 – Biblioteca Nazionale (library) opens.^[8][9]
• 1808 – Reggio becomes seat of the Crostolo department in the French Cisalpine Republic.^[3]
• 1819 – Reale Accademia Reggiana di Scienze, Lettere ed Arti established.^[7]
• 1830 – Musei Civici di Reggio Emilia (museum) active.^[10]
• 1856 – Reggio Emilia Synagogue [it] built.
• 1857 – Teatro Municipale (theatre) opens.^[1]
• 1859
  • Reggio Emilia railway station opens.
  • Reggio becomes part of the Kingdom of Piedmont-Sardinia.^[1]
• 1860 – Gazzetta di Reggio newspaper begins publication.^[11]
• 1861 – Reggio becomes part of the Kingdom of Italy.^[3]
• 1862 – Chamber of Commerce established.^[12]
• 1873 – Dismantling of the Walls of Reggio Emilia [it] begins.^[12]
• 1887 – Ferrovia Reggio Emilia-Guastalla [it] (railway) in operation.
• 1892 – Ferrovia Reggio Emilia-Sassuolo [it] (railway) in operation.
• 1897 – Population: 59,117.^[13]
• 1900 – Basilica della Ghiara restored.^[1]

20th century

• 1901
  • Officine Meccaniche Reggiane manufactory in business.^[12]
  • Camera del Lavoro established.^{[citation needed]}
• 1906 – Population: 64,548.^[1]
• 1910 – Stadio Mirabello (stadium) built.
• 1911
  • Ferrovia Reggio Emilia-Ciano d'Enza [it] (railway) in operation.
  • Population: 70,419.^[14]
• 1919 – A.C. Reggiana 1919 (football club) formed.
• 1927 – Ferrovia Reggio Emilia-Boretto [it] (railway) begins operating.
• 1931 – Population: 91,040.^[4]
• 1944 – 8 January: Bombing of Reggio by Allied forces during World War II.^{[citation needed]}
• 1945 – Cesare Campioli becomes mayor (until 1962).
• 1965 – Istituto per la Storia della Resistenza e della Società contemporanea (history institute) active.^[15]
• 1995 – Mapei Stadium – Città del Tricolore opens.

21st century

• 2013 – Population: 163,928.^[16]
• 2014 – Local election held; Luca Vecchi becomes mayor.