912 (CMXII) was a leap year starting on Wednesday of the Julian calendar, the 912th year of the Common Era (CE) and Anno Domini (AD) designations, the 912th year of the 1st millennium, the 12th year of the 10th century, and the 3rd year of the 910s decade. As of the start of 912, the Gregorian calendar was 5 days ahead of the Julian calendar, which was the dominant calendar of the time.

• May 11 – Alexander becomes Emperor of the Byzantine Empire.

for more information, see Category:912 births.

• November 23 – Otto I the Great

for more information, see Category:912 deaths.