The Ala-Buga (, also Алабуга) is a left tributary of the Naryn in Naryn Region of Kyrgyzstan. The river is known as Arpa in its upper reaches until its confluence with the Bychan. The Ala-Buga is formed on the north slopes of the Torugart Too range and the south slopes of the Jaman Too mountains. It is 180 km long, and has a drainage basin of 5820 km2. It has an average elevation of 3290 m, an annual average flow rate of 31 m3/s, and an average specific discharge of 8.35 L/s•km2. Settlements located along the banks of Ala-Buga include Kosh-Döbö, Jerge-Tal and Kongorchok.