People
* Siân, a Welsh girl's name; list of people with this namePlaces
* Sian, Iran (disambiguation), various places in Iran, Iraq and Balochistan * Sian, Russia, a rural locality in Amur Oblast, Russia *Other uses
* Lamborghini Sián FKP 37, an Italian sports car * Sian (band), Scottish traditional music band * Sian (crater), a crater on Mars * Sian language, a Kajang language of Brunei and Sarawak * SIANspheric, Canadian band formerly named ''Sian'' * Stop the Islamisation of Norway (, SIAN), a Norwegian anti-Islam group which was established in 2008 * Siyan, a Kurdish tribeSee also
* * Sain (disambiguation) * Sihan language, a Papuan language of Papua New Guinea * Syan language, a Bantu language spoken in East Africa * Syan (disambiguation) * Sayan (disambiguation) {{Disambig, geo