Siwan may refer to Sivan, a month of the Hebrew calendar The Welsh form of Joan (first name) Siwan or Joan, Lady of Wales, the wife and consort of Llywelyn the Great, Prince of Wales Siwan (play), by Saunders Lewis Sewant, beads used as a currency by Native Americans Siwan (album), a musical orchestra project by Jon Balke, and featuring Amina Alaoui Siwan, Henan, a town in Xichuan County, Henan, China India Siwan District, in the state of Bihar, India Siwan, Bihar, the headquarters of the Siwan district Siwan Subdivision, a subdivision of Siwan district Siwan block, a Community development block in Siwan district Siwan (Lok Sabha constituency), a parliamentary constituency in Bihar, India Siwan (Vidhan Sabha constituency), a Legislative constituency in Bihar, India , a railway junction station in the state of Bihar, India Siwan, a village in Uttar Pradesh, India People People with given name Siwan Siwan, a Korean singer, member of boy group ZE:A Siwan Morris, Welsh actress