Sienno may refer to the following places:
- Sienno, Słupca County in Greater Poland Voivodeship (west-central Poland)
 - Sienno, Kuyavian-Pomeranian Voivodeship (north-central Poland)
 - Sienno, Masovian Voivodeship (east-central Poland)
 - Sienno, Wągrowiec County in Greater Poland Voivodeship (west-central Poland)
 - Sienno, Lubusz Voivodeship (west Poland)
 - Sienno, West Pomeranian Voivodeship (north-west Poland)
 
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