1625 (MDCXXV) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1625th year of the Common Era (CE) and Anno Domini (AD) designations, the 625th year of the 2nd millennium, the 25th year of the 17th century, and the 6th year of the 1620s decade. As of the start of 1625, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.