| Syanno | |
| Settlement Type: | Town |
| Flag Size: | 150 |
| Pushpin Label: | Syanno |
| Pushpin Map: | Belarus |
| Pushpin Label Position: | left |
| Subdivision Type: | Country |
| Subdivision Name: | Belarus |
| Subdivision Type1: | Region |
| Subdivision Name1: | Vitebsk Region |
| Subdivision Type2: | District |
| Subdivision Name2: | Syanno District |
| Established Title: | First mentioned |
| Established Date: | 1442 |
| Population As Of: | 2024 |
| Population Footnotes: | [1] |
| Population Total: | 7,090 |
| Population Density Km2: | auto |
| Timezone: | MSK |
| Utc Offset: | +3 |
| Coordinates: | 54.8°N 71°W |
| Elevation M: | 176 |
| Postal Code Type: | Postal code |
| Postal Code: | 211117 |
| Area Code: | +375 2135 |
| Blank Name: | License plate |
Syanno or Senno (be|Сянно|Sianno; ru|Сенно; pl|Sienno; lt|Siano) is a town in Vitebsk Region, Belarus. It is located 58km (36miles) southwest of Vitebsk on the southern shore of Senno Lake. In 2018, its population was 7,092. As of 2024, it has a population of 7,090.[1]
The village is first mentioned in a document of 1442.[2] Fairs were held there, and a lively hay market gave it its name (ru|сено seno 'hay'). From the first half of the 17th century it belonged to the Sapieha family; from the second half of the 18th century, to the Ogińskis. In 1772 it became part of the Russian Empire.
In 1924, Senno became part of the Byelorussian Soviet Socialist Republic. During World War II, it was the site of a major tank battle in July 1941.[3]