1100s

The 1100s was a decade that began on 1 January 1100, and ended on 31 December 1109. It is distinct from the decade known as the 111th decade which began on January 1, 1101 and ended on December 31, 1110.

 Events and trends 
 The Ancient Pueblo Peoples culture rises (approximate date).
 The great Buddhist centre of learning at Nalanda is destroyed by invaders.
 The city of Cusco, Peru is founded.
 Emperor Huizong of Song starts to rule in China.
 1102 Bolesław III becomes duke of Poland.
 The Hohenbaden castle is built in Baden-Baden, Germany.
 1104 The volcano Hekla erupts in Iceland, destroying settlements.
 1107 Emperor Toba ascends the throne of Japan.