| Official Name: | Siyannu |
| Native Name: | سيانو |
| Settlement Type: | Village |
| Pushpin Map: | Syria |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 250 |
| Pushpin Map Caption: | Location in Syria |
| Subdivision Type: | Country |
| Subdivision Type1: | Governorate |
| Subdivision Name1: | Latakia |
| Subdivision Type2: | District |
| Subdivision Name2: | Jableh District |
| Subdivision Type3: | Subdistrict |
| Subdivision Name3: | Jableh |
| Unit Pref: | Metric |
| Population As Of: | 2004 |
| Population Total: | 4,784 |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Timezone: | EET |
| Utc Offset: | +3 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 35.3653°N 36.0028°W |
| Blank Name Sec1: | City Qrya Pcode |
| Blank Info Sec1: | C3582 |
Siyannu (ar|سيانو) 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.[1]
Siyannu, which was also known as Ušnatu,[2] was part of Ugarit, before having its independence and becoming a border region with Amrit during the reign of the Hittite King Muršili II.[3]
Siyannu/Shianu,[4] led by King Adunu Baal, took part in the Battle of Qarqar against the invading Assyrians.[5]
Nahr as-Sinn was also called "Siyannu" which marked the southern borders of Ugarit.[6]