1750

January–March

• January 13 - The Treaty of Madrid between Spain and Portugal authorizes a larger Brazil than had the Treaty of Tordesillas of 1494, which originally established the boundaries of the Portuguese and Spanish territories in South America.
• January 24 - A fire in Istanbul destroys 10,000 homes.
• February 15 - After Spain and Portugal agree that the Uruguay River will be the boundary line between the two kingdoms' territory in South America, the Spanish Governor orders the Jesuits to vacate seven Indian missions along the river.
• March 5 - The Murray-Kean Company, a troupe of actors from Philadelphia, gives the first performance of a play announced in advance in a newspaper, presenting Richard III at New York City's Nassau Street Theatre.
• March 20 - The first number of Samuel Johnson's The Rambler appears.

  April–June

• April 13 - Dr. Thomas Walker and five other men cross through the Cumberland Gap, a mountain pass through the Appalachian Mountains, to become the first white people to venture into territories that had been inhabited exclusively by various Indian tribes. On April 17, Walker's party continues through what is now Kentucky and locates the Cumberland River, which Walker names in honor of Prince William, Duke of Cumberland.
• April 14
• *A group of West African slaves, bound for America, successfully overpowers the British crew of the slave ship Snow Ann, imprisons the survivors, and then navigates the ship back to Cape Lopez in Gabon. Upon regaining their freedom, the rebels leave the survivors on the Gabonese coast.
• *The Viceroy of New Spain, Juan Francisco de Güemes, issues a notice to the missionaries in Nuevo Santander to work peacefully to convert the indigenous Karankawa people to Roman Catholicism.
• April 25 - The Acadian settlement in Beaubassin, Nova Scotia, is destroyed by French-backed armies, and the population is forcibly relocated, after France and Great Britain agree that the Missaguash River should be the new boundary between French Nova Scotia and British New Brunswick
• May 16 - Two weeks after police in Paris arrest six teenagers for gambling in the suburb of Saint-Laurent, rioting breaks out when a rumor spreads that plainclothes policemen are hauling off small children between the ages of five to ten years old, in order to provide blood to an ailing aristocrat. Over the next two weeks, rioting breaks out in other sections of Paris. Police are attacked, including one who is beaten to death by the mob, until order is restored and police reforms are announced.
• June 19 - At a time when mountain climbing is still relatively uncommon, Eggert Ólafsson and Bjarni Pálsson scale their first peak, the high Icelandic volcano, Hekla.
• June 24 - Parliament passes Britain's Iron Act, designed to restrict American manufactured goods by prohibiting additional ironworking businesses from producing finished goods. At the same time, import taxes on raw iron from America are lifted in order to give British manufacturers additional material for production. By 1775, the North American colonies have surpassed England and Wales in iron production and have become the world's third largest producer of iron.
• June 29 - An attempt in Lima, to begin a native uprising against Spanish colonial authorities in the Viceroyalty of Peru, is discovered and thwarted. One of the conspirators, Francisco Garcia Jimenez, escapes to Huarochirí and kills dozens of Spaniards on July 25.

  July–September

• July 9 - Traveller Jonas Hanway leaves St. Petersburg to return home, via Germany and the Netherlands. Later the same year, Hanway reputedly becomes the first Englishman to use an umbrella.
• July 11 - Halifax, Nova Scotia is almost completely destroyed by fire.
• July 31 - José I takes over the throne of Portugal from his deceased father, João V. King José Manuel appoints the Marquis of Pombal as his Chief Minister, who then strips the Inquisition of its power.
• August 8 - In advance of the Province of Georgia changing in status from a corporate-owned American settlement to a British colony, Royal Assent is given to an act that lifts the province's ban on slavery; effective January 1, "it shall and may be lawful to import or bring Black Slaves or Negroes in to the Province of Georgia of America and to keep and to use the same therein".
• August 20 - French astronomer Nicolas-Louis de Lacaille, by way of the Foreign Minister, the Marquis de Puisieulx and Netherlands ambassador to Paris Mattheus Lestevenon, sends a letter that ultimately persuades the States-General of the Dutch Republic to allow and partially finance Lacaille's stellar trigonometry mission to the Cape of Good Hope. The expedition departs Lorient on October 21
• September 30 - Crispus Attucks, an African-American slave who will later become the first person killed in the Boston Massacre of 1770, escapes from the Framingham, Massachusetts estate of slaveowner William Brown. In an unsuccessful attempt to recapture the fugitive, Brown runs an advertisement on October 2 in the Boston Gazette, but Attucks eludes recapture.

  October–December

• October 5 - Spain and the United Kingdom sign a treaty temporarily eliminating their hostility over their colonies in the North and South America. In addition to both sides dropping their claims for damages against each other, Spain agrees to pay the South Sea Company £100,000 for damage claims.
• October 14 - The Louvre Museum is created in Paris four years after art critic Lafond de Saint-Yenne calls on the King to allow the display of the royal art collection to the general public. Abel-François Poisson, the Marquis de Marigny, arranges for the display of 110 of the Crown's paintings at the Palais du Luxembourg.
• November 11 - A riot breaks out in Lhasa after the murder of the regent of Tibet.
• November 18 - Westminster Bridge is officially opened in London.
• December 3 - What is described later as "The first documented presentation of a musical in New York" takes place one block east of Broadway, at the Nassau Street Theatre, when a resident company of actors stages The Beggar's Opera.
• December 25 - Prussia and Russia break off diplomatic relations after the Russians refuse to stop assisting the Electorate of Saxony Five years later, the two Empires fight the Seven Years' War.
• December 29 - Two physicians in Jamaica, Dr. John Williams and Dr. Parker Bennet, fight a duel "with swords and pistols" after having had an argument the day before about the treatment of bilious fever. Both are mortally wounded during the fight

  Date unknown

• Hannah Snell reveals her sex to her Royal Marines compatriots.
• The King of Dahomey has income of 250,000 pounds from the overseas export of slaves.
• Maruyama Okyo paints The Ghost of Oyuki.
• Britain produces c. 2% of the entire world's output of industrial goods, and the Industrial Revolution begins.
• Galley slavery is abolished in Europe.
• World population: 791,000,000
• * Africa: 106,000,000
• * Asia: 502,000,000
• * Europe: 163,000,000
• * Latin-America: 16,000,000
• * Northern America: 2,000,000
• * Oceania: 2,000,000