Siana is a city in Uttar Pradesh, India.
Siana may also refer to:
- Syana Tehsil, in Uttar Pradesh, India
- Siana, Rajasthan, a village in Rajasthan, India
- Siana, Greece, a settlement in Rhodes, Greece
- Siana, Asturias, a parish in Mieres, Asturias, Spain.
- Siana (given name)