The Sanremo Music Festival 1991 (), officially the 41st Italian Song Festival (), was the 41st annual Sanremo Music Festival, held at the Teatro Ariston in Sanremo between 27 February and 2 March 1991 and broadcast by (RAI). The show was presented by actors Andrea Occhipinti and Edwige Fenech. Adriano Aragozzini served as artistic director.
According to the rules of this edition, each song of the Big Artists section was presented in a double performance by a non-Italian singer or group, and adapted in their foreign language. The winner of the Big Artists section was Riccardo Cocciante with the song "Se stiamo insieme", while Enzo Jannacci won the critics award with the song "La fotografia". Paolo Vallesi won the "Newcomers" section with the song "Le persone inutili".
All shows were broadcast on Rai Uno.
Known details on the broadcasts in each country, including the specific broadcasting stations and commentators are shown in the tables below.