The Yemtsa or Yomtsa is a river in Plesetsky and Kholmogorsky Districts and in the town of Mirny of Arkhangelsk Oblast in Russia. It is a left tributary of the Northern Dvina River. It is long, and the area of its basin . Its main tributaries are the Mekhrenga (right), the Tyogra (left), the Vaymuga (left), and the Bolshaya Chacha (right).