1751

1751 (MDCCLI) was a common year starting on Friday of the Gregorian calendar and a common year starting on Tuesday of the Julian calendar, the 1751st year of the Common Era (CE) and Anno Domini (AD) designations, the 751st year of the 2nd millennium, the 51st year of the 18th century, and the 2nd year of the 1750s decade. As of the start of 1751, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.

In Britain and its colonies (except Scotland), the year 1751 began on 25 March as usual, but ended it on 31 December (rather than nearly three months later according to its previous rule) and had only 282 days. This was due to the Calendar (New Style) Act 1750 (by which it adopted the Gregorian calendar).