1351 (MCCCLI) was a common year starting on Saturday of the Julian calendar, the 1351st year of the Common Era (CE) and Anno Domini (AD) designations, the 351st year of the 2nd millennium, the 51st year of the 14th century, and the 2nd year of the 1350s decade. As of the start of 1351, the Gregorian calendar was 8 days ahead of the Julian calendar, which was the dominant calendar of the time.

• May 1 – Zürich became a part of Switzerland.