A constitutional referendum was held in Niger on 24 September 1989. The new constitution would make the country a one-party state with the National Movement for the Development of Society as the sole legal party. The government would have a presidential system, as well as the continued involvement of the Armed Forces, which had ruled the country since the military coup in 1974.

1989 Nigerien constitutional referendum

24 September 1989 (1989-09-24)
Results
Choice Votes % Yes 3,275,737 99.28% No 23,713 0.72% Valid votes 3,299,450 99.78% Invalid or blank votes 7,425 0.22% Total votes 3,306,875 100.00% Registered voters/turnout 3,477,874 95.08%

It was approved by 99.3% of voters with a 94.9% turnout.^[1] The first elections under the new constitution were held later in the year on 12 December.