The best selling album in 1990 in Portugal was BUT SERIOUSLY by PHIL COLLINS.
| Rank | Artist | Album | Released |
| 1 | PHIL COLLINS | BUT SERIOUSLY | 1989 |
| 2 | RUI VELOSO | MINGOS & OS SAMURAIS | 1990 |
| 3 | GIPSY KINGS | MOSAIQUE | 1989 |
| 4 | MADREDEUS | EXISTIR | 1990 |
| 5 | MADONNA | I'M BREATHLESS (SOUNDTRACK) | 1990 |
| 6 | TECHNOTRONIC | PUMP UP THE JAM | 1989 |
| 7 | CAT STEVENS (YUSUF ISLAM) | THE VERY BEST OF CAT STEVENS | 1990 |
| 8 | ROBERTO CARLOS | AMAZÓNIA | 1990 |
| 9 | THE THREE TENORS | IN CONCERT | 1990 |
| 10 | ROGER WATERS | THE WALL - LIVE IN BERLIN | 1990 |
Source: AFP