← → Events in the year 1991 in Portugal.

Portugal participated in the Eurovision Song Contest 1991 with Dulce Pontes and the song "Lusitana paixão".

In association football, for the first-tier league seasons, see 1990–91 Primeira Divisão and 1991–92 Primeira Divisão; for the cup seasons, see 1990–91 Taça de Portugal and 1991–92 Taça de Portugal