| Sennar | |
| Native Name: | سنار |
| Other Name: | Sinnar |
| Settlement Type: | State |
| Mapsize: | 299px |
| Subdivision Type: | Country |
| Subdivision Name: |  Sudan |
| Subdivision Type1: | Region |
| Subdivision Name1: | Sennar State |
| Subdivision Type2: | No. of counties |
| Seat Type: | Capital |
| Government Type: | State Government |
| Leader Title: | Governor |
| Leader Name: | Aldaw Almahi |
| Established Title: | Governor |
| Established Date: | 2015 |
| Area Total Km2: | 37844 |
| Population As Of: | 2018 |
| Population Total: | 1918692[1] |
| Timezone: | CAT |
| Utc Offset: | +2 |
| Coordinates: | 12.9667°N 37°W |
| Blank Name Sec2: | HDI (2017) |
| Blank Info Sec2: | 0.493[2] |
Sennar () is one of the 18 wilayat or states of Sudan. It has an area of and had a population of approximately 1,918,692 in 2018.
Sinar State is delimited by Al-Gazira State in the north, The Blue Nile State in the south, Al-Gedaref State and the Sudanese Ethiopian borders in the east, and the White Nile State & the Upper Nile State of South Sudan in the west. It remains unknown whether Singa is the capital of Sennar State or whether the largest city Sennar (also known as Mukwar) is the capital, as some sources and maps list Singa and some list Sennar city. Other commercial towns include El-Suki and El-Dinder.
The main economic activity is agriculture, with the irrigated scheme of Suki, the sugar factory of Sennar, and a number of fruit growers (including bananas and mangoes) located on the banks of the Blue Nile. In terms of education The University Of Sennar is the only higher education university throughout all the state, attended by all its residents.
The state is famous for its Dinder National Park.