The Adycha (Russian: Адыча; Yakut: Адыаччы, Adıaccı) is a river in the Republic of Sakha in Russia. It is a right hand tributary of the Yana, and is 715 kilometres long, with a drainage basin of 89,800 square kilometres.
River Adycha freezes in October and is under thick ice until the end of May. For about 4½ months it is frozen to the bottom. Part of the river is navigable after the thaw.
