899 (DCCCXCIX) was a common year starting on Monday of the Julian calendar, the 899th year of the Common Era (CE) and Anno Domini (AD) designations, the 899th year of the 1st millennium, the 99th year of the 9th century, and the 10th and last year of the 890s decade. As of the start of 899, the Gregorian calendar was 4 days ahead of the Julian calendar, which was the dominant calendar of the time.

• Edward the Elder becomes King of England.
• Gorm the Old becomes King of Denmark.
• Regino of Prüm is expelled from Prüm and becomes abbot of St. Martin's in Trier.

for more information, see Category:899 deaths.