Atan may refer to: Places Atan, Armenia Atan, Iran People Atan Shansonga (born 1955), Zambian diplomat Çağdaş Atan, Turkish footballer Cem Atan, Turkish footballer Other Attan, a Pashtun and Afghan traditional dance arctangent, a trigonometric function atan2, the two-argument function implementing the arctangent in many computer languages Turkish-language surnames