A referendum on a new constitution was held in Sierra Leone in August 1991.

Voting was held over four days (23, 26, 28 and 30 August).

[1] The new constitution would restore multi-party politics, as the country had been a one-party state since the 1978 constitutional referendum made the All People's Congress the only legally permitted party.

The new constitution was approved by around 80% of voters,[1] and came into force on 1 October.

[3] Due to a coup eight months after the referendum, the first elections under the new constitution were not held until 1996.