1755 (MDCCLV) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1755th year of the Common Era (CE) and Anno Domini (AD) designations, the 755th year of the 2nd millennium, the 55th year of the 18th century, and the 6th year of the 1750s decade. As of the start of 1755, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.

• January 25 – Moscow University established.
• February 20 – General Braddock lands in Virginia to take command of the English forces against the French in North America
• April 15 – A Dictionary of the English Language is published by Samuel Johnson; he had begun the work in 1746
• July 9 – French and Indian War: Braddock Expedition – British troops and colonial militiamen are ambushed and suffer a devastating defeat inflicted by French and Indian forces. During the battle, British General Edward Braddock is mortally wounded. Colonel George Washington survives.
• November 1 – 1755 Lisbon earthquake: In Portugal, Lisbon is destroyed by a massive earthquake and tsunami, killing 60,000 – 90,000 people.
• November 18 – An earthquake occurs near Cape Ann, Massachusetts, causing extensive damage.
• December 2 – The second Eddystone Lighthouse is destroyed by fire.
• Great Expulsion of the Acadians.
• The sultanate of Mataram on Java is divided in two, creating the sultanates of Yogyakarta and Surakarta.
• The Acadians were forced to leave their home because of the treaty of uresty between the French and the British
• Wolsey the clothes manufacturer was established in Leicester; the business celebrated its 250th anniversary in 2005.

for more information, see Category:1755 births.

for more information, see Category:1755 deaths.