The Sanusi order or Sanusiyyah (Arabic: السنوسية, romanized: as-Sanūssiyya) are a Muslim political-religious Sufi order (tariqa) in Libya and North Africa founded in Mecca in 1837 by Muhammad ibn Ali al-Sanusi.
During World War I the Senusi order fought against both Italy and Britain. During World War II, the order provided support to the British Eighth Army in North Africa against Nazi and Fascist Italian forces. The founder's grandson became King Idris I of Libya in 1951. The 1969 Libyan revolution led by Muammar Gaddafi overthrew him, ending the Libyan monarchy. The movement remained active despite persecution by Gaddafi's government, and its cultural legacy continues to this day in Libya, centered on Cyrenaica.