| Conventional Long Name: | Kingdom of Niani |
| Common Name: | Niani |
| Status: | Kingdom |
| Government Type: | Monarchy |
| Year Start: | 14th century |
| Year End: | 1888 |
| Event Start: | Founding by Cansia Kamara |
| Event End: | French protectorate established |
| P1: | Mali Empire |
| S1: | Gambia Colony and Protectorate |
| Flag S1: | Flag of The Gambia (1889–1965).svg |
| S2: | French Senegal |
| Flag S2: | Flag of France.svg |
| Capital: | Koumpentoum |
| Common Languages: | Mandinka |
| Religion: | African traditional religions, Islam |
| Currency: | cloth, salt, gold |
| Leader1: | Cansia Kamara |
| Leader2: | Kimintan Kamara |
| Year Leader1: | 14th century |
| Year Leader2: | 1820s |
| Title Leader: | Mansa |
Niani was a Mandinka kingdom located on the north bank of the Gambia River from approximately the 14th to the late 19th century in what is now The Gambia and Senegal.
Oral histories relate that, during the 14th century, many members of the Kamara clan left the town of Niani in the Mali Empire after a failed rebellion against the Mansa. They initially settled in Kaabu, then crossed the Gambia river.[1] At the time the area was a part of the Kingdom of Wuli, but some sources claim that the Kamara were given the land by the Buurba of the Jolof Empire. Two brothers, Cansia and Mansaly Kamara, established separate branches of the family in Niani, with Cansia founding Koumpentoum as the capital of his new kingdom, named after the homeland they had left behind.[1] The Kamara would rule the state until its incorporation into the French colony of Senegal in the late 19th century. The capital was later moved to Diambour, and eventually to Ndougousine in the 19th century.
Modern-day historians have proposed that the Mandinka elite of Niani and Wuli did not, in fact, immigrate from the Manding region but may have come much earlier, from Bambouk and the upper Senegal river valley.[2] The migration story may be a dramatization of what was actually a gradual process of ethnic transformation under the cultural and political hegemony of the Mali Empire.[3]
Always an important center, the arrival of Europeans in the 15th century greatly Niani's trade, particularly channeling gold from Bambuk and Bure down the Gambia. Nianimaru, a village marking the furthest navigable point on the river for large seafaring ships, was particularly prosperous. Torodbe refugees from Futa Toro in the late 18th and early 19th centuries progressively islamized the kingdom, although the aristocracy retained their traditional beliefs.
During the 19th century upper and lower Niani were ruled by separate Kamara branches.[4] Sometime in the early decades, Kimintan Kamara killed his older brothers to seize the throne of Upper Niani and established a new capital at Ndougousine.
In 1823, Kolli Kamara, king of Kataba (lower Niani) ceded MacCarthy Island to the British, who built Georgetown there.[5] A dispute ensued when the colonists demanded labor from Niani, but the Kamara sent an army instead, forcing the British to take refuge in their new fort. A counterattack on Ndougousine failed, with the Mandinka capturing two cannons.[4]
The region-wide Marabout Wars of the 19th century, particularly the campaigns of Mahmadu Lamine, devastated regional trade and Niani's economy. In 1888 the kingdom signed a protectorate treaty with France, ending its independence.