1872 (MDCCCLXXII) was a leap year starting on Monday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1872nd year of the Common Era (CE) and Anno Domini (AD) designations, the 872nd year of the 2nd millennium, the 72nd year of the 19th century, and the 3rd year of the 1870s decade. As of the start of 1872, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
