坎大哈（普什图语：قندهار‎，波斯语：قندهار‎），阿富汗第二大城市，位于该国南部，是阿富汗南部的经济、文化、交通中心，也是普什图族聚居的中心城市。

坎大哈建城于公元前4世纪，在很长的时间里都是波斯和印度诸王朝争夺的军事重镇。1747年，艾哈迈德·沙阿·杜兰尼在此称王，创建阿富汗王国，以坎大哈为首都。虽然阿富汗的首都很快便迁往喀布尔，但是坎大哈作为阿富汗南部地区中心的地位自此一直未被动摇。

1995年，塔利班便是从坎大哈突然崛起，几乎一统阿富汗。阿富汗前总统哈米德·卡尔扎伊，也是出身坎大哈的部族首领家庭。

Kandahar (/ˈkændəˌhɑːr/) or Qandahar (Pashto:کندهار‎ Kandahār, Persian: قندهار, Qandahār, known in older literature as Candahar) is the second-largest city in Afghanistan, with a population of about 491,500 as of 2012. Formerly called Alexandria Arachosia, the city is named after Alexander the Great, who founded it in 329 BC around a small ancient Arachosian town. Kandahar is the capital of Kandahar Province, located in the south of the country at an altitude of 1,010 m above sea level. The Arghandab River runs along the west of the city. The city of Kandahar has a population of 557,118. It has 15 districts and a total land area of 27,337 hectares. The total number of dwellings in Kandahar is 61,902.