1861 (MDCCCLXI) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1861st year of the Common Era (CE) and Anno Domini (AD) designations, the 861st year of the 2nd millennium, the 61st year of the 19th century, and the 2nd year of the 1860s decade. As of the start of 1861, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
