Siwan
- Joan (first name)
- Joan, Lady of Wales
- Mandaean calendar
- Sewant
- Sivan
- Siwan (Mandaean month)
- Siwan (album)
- Siwan (community development block)
- Siwan (play)
- Siwan Assembly constituency
- Siwan Junction railway station
- Siwan Lillicrap
- Siwan Lok Sabha constituency
- Siwan Morris
- Siwan district
- Siwan subdivision
- Siwan, Bihar
- Siwan, Henan
- Siwan, Raebareli
- Yim Si-wan