Senno, also known as Syanno, is a town located in the Vitebsk Region of Belarus. It serves as the administrative center for the Syanno District.
The town is situated on the southern shore of Senno Lake, approximately 58 km (36 mi) southwest of the city of Vitebsk. As of 2025, the population of the town is 6,974; in 2018, it was recorded at 7,092.