Niger–Nigeria relations refer to the current and historical relationship between Niger and Nigeria, two neighbouring countries in West Africa.

During colonial rule, the French and English languages were implanted on each side of the border, along with cultural, educational and political traditions.

Despite this, common Hausa language and cultural ties meant that there was much informal trade and travel over the long border during the colonial period.

Each side has also strongly appealed to its former colonial powers for support in defense and, unlike Nigerian-Cameroonian or Nigerien-Beninois relations, there have been no serious border conflicts.

Bilaterally, the two nations formed the Nigeria-Niger Joint Commission for Cooperation (NNJC), established in March, 1971 with its Permanent Secretariat in Niamey, Niger.

On 15 January 1990 the two nations signed The Abuja Agreement on control of desertification, promotion of conservation, rational utilization and development of lands, water resources, flora and fauna.

The Maiduguri Agreement, signed on 18 July 1990, and amended 5 October 1998, further deals with development, conservation, and utilization of the water resources of transboundary catchments.