Habibullah Kalakani (1870 or 1891 – 1 November 1929), born as Habibullah Mohammad Aminullah, and derogatively called "Bacha-ye Saqao" (also romanized Bachai Sakao; literally son of the water carrier), was the ruler of Afghanistan from 17 January to 13 October 1929, as well as a leader of the Saqqawists. During the Afghan Civil War (1928–1929), he captured vast swathes of Afghanistan and ruled Kabul during what is known in Afghan historiography as the "Saqqawist period". He was an ethnic Tajik. No country recognized Kalakani as ruler of Afghanistan.
During the 1928–1929 Afghan Civil War he contested the Afghan throne with Amanullah Khan. After defeating Amanullah, he was eventually defeated by Mohammad Nadir Shah. Khalilullah Khalili, a noted historian and Kohistani poet laureate, depicted King Habibullah Kalakani as the "best manager of governmental imports and exports".