989 (CMLXXXIX) was a common year starting on Tuesday of the Julian calendar, the 989th year of the Common Era (CE) and Anno Domini (AD) designations, the 989th year of the 1st millennium, the 89th year of the 10th century, and the 10th and last year of the 980s decade. As of the start of 989, the Gregorian calendar was 5 days ahead of the Julian calendar, which was the dominant calendar of the time.

• September – Halley's Comet is at perihelion
• Sankore University founded in Timbuktu

• Adémar de Chabannes (died 1034), monk and historian
• Gisela of Swabia (died 1043), Holy Roman Empress

• 6 September – Sharaf al-Daula, emir of Kerman and Fars