Tribuno Memmo (died 991) was the 25th Doge of Venice who served from 979 to 991.

He was illiterate and according to preserved documents, he signed via signum manus.

It was still in repairs following the fire which occurred during the overthrow of Pietro IV Candiano.

During his dogeship, St Mark's Basilica became by decree a ducal property, a sort of private chapel in which the ecclesiastical functions were delegated to the primicerius.

On 7 June 983, Emperor Otto II renewed the commercial privileges that had already been enjoyed by many previous Doges.