1659 (MDCLIX) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1659th year of the Common Era (CE) and Anno Domini (AD) designations, the 659th year of the 2nd millennium, the 59th year of the 17th century, and the 10th and last year of the 1650s decade. As of the start of 1659, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.