1941 (MCMXLI) was a common year starting on Wednesday of the Gregorian calendar, the 1941st year of the Common Era (CE) and Anno Domini (AD) designations, the 941st year of the 2nd millennium, the 41st year of the 20th century, and the 2nd year of the 1940s decade.

The Correlates of War project estimates this to be the deadliest year in human history in terms of conflict deaths, placing the death toll at 3.49 million. However, the Uppsala Conflict Data Program estimates that the subsequent year, 1942, was the deadliest such year. Death toll estimates for both 1941 and 1942 range from 2.28 to 7.71 million each.

Below, the events of World War II have the "WWII" prefix.