1848 was a leap year.
January 1 — Vladimir Jakšić, a professor at the Belgrade Lyceum, began the first instrumental meteorological measurements and observations in Belgrade and Serbia, which continued continuously for 52 years, until Jakšić's death in 1899 (1848—1899).
January 12 — An uprising against the Bourbon Kingdom of the Two Sicilies began in Palermo.
January 24 — James W. Marshall found gold at Sutter's Mill in Coloma, which led to the California Gold Rush.
February 21 — Karl Marx and Friedrich Engels published the Communist Manifesto.
March 13 — Under the pressure of demonstrations and rebellion in Vienna, Austrian Chancellor Clemens Metternich resigned.
March 15 — The Hungarian Revolution began with street protests in Budapest.
March 22 — Rebellious Venice declared independence from Austria and briefly restored the Republic of Venice.
May 13 — The session of the May Assembly began in Sremski Karlovci, where the delegates of 175 church municipalities from Vojvodina and Serbia elected Josif Rajačić as patriarch and Colonel Stevan Šupljikc as duke.
June 2 — The session of the First All-Slavic Congress began in Prague.
June 11 — Anglophone settlers in Sonoma begin a rebellion against Mexico and declare the Republic of California.
June 23 — The June uprising of Parisian workers began due to the expulsion of the socialists from the provisional government and the closing of the people's workshops.
June 29 — Peter's Assembly in Kragujevac (1848)
July 23 - July 25 - Battle of Kustoca (1848)
September 12 — Switzerland adopts a new Constitution making it a federal union with a strong central government.
October 31 — Imperial troops under Field Marshal Alfred Windischgratz capture Vienna, putting down the eight-month Vienna Uprising during which a revolutionary government was established.
October 31 — Mexican Emperor Agustin de Iturbide dissolves the Mexican Congress and replaces it with a military junta.
November 7 — In the US presidential election, Zachary Taylor is elected president, defeating the Democratic candidate, Louis Cass.
December 2 - Austrian Emperor Ferdinand I abdicated in favor of his nephew Fr�