1189 (MCLXXXIX) was a common year starting on Sunday of the Julian calendar, the 1189th year of the Common Era (CE) and Anno Domini (AD) designations, the 189th year of the 2nd millennium, the 89th year of the 12th century, and the 10th and last year of the 1180s decade. As of the start of 1189, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

• January 21 – Philip II of France and Richard I of England begin to assemble troops to wage the Third Crusade
• September 3– Richard I of England is crowned as king of England.
• August 29– Ban Kulin wrote "The Charter of Kulin", which become a symbolic "birth certificate" of Bosnian statehood
• This year was fixed as the start of time immemorial in English law in 1276.
• Beginning of the Siege of Acre.
• The Crusader castles of Montreal and Kerak are captured by Saladin.

• Yuri II, grand prince of Vladimir (d. 1238)

• July 6 — King Henry II of England (b. 1133)