Atsiz (1098–1156), Khwarazmshah from 1127 to 1156

Atsiz or Atsız may also refer to:

• Atsiz ibn Uwaq (died 1079), ruler of Palestine from 1071 to 1079
• Ala al-Din Atsiz (c. 1159 – c. 1214), Sultan of the Ghurids from 1213 to 1214
• Nihal Atsız (1905–1975), Turkish nationalist writer