Siyannu () is a Syrian village in Jableh District in Latakia Governorate. According to the Syria Central Bureau of Statistics (CBS), Siyannu had a population of 4,784 in the 2004 census.
Siyannu (Tell Siyannu), which was also known as Uà ¡natu, was part of Ugarit, before having its independence and becoming a border region with Amrit during the reign of the Hittite King Murà ¡ili II.
Siyannu/Shianu, led by King Adunu Baal, took part in the Battle of Qarqar against the invading Assyrians.