The best selling album in 1998 in Portugal was SILENCE BECOMES IT by SILENCE 4.
| Rank | Artist | Album | Released |
| 1 | SILENCE 4 | SILENCE BECOMES IT | 1998 |
| 2 | NETINHO | NETINHO AO VIVO | 1996 |
| 3 | SOUNDTRACK | TITANIC | 1997 |
| 4 | ERA | ERA | 1996 |
| 5 | EXCESSO | EU SOU AQUELE | 1997 |
| 6 | BANDA EVA | BANDA EVA AO VIVO | 1997 |
| 7 | DANIELA MERCURY | FEIJÃO COM ARROZ | 1997 |
| 8 | RICKY MARTIN | VUELVE | 1998 |
| 9 | U2 | THE BEST OF 1980 - 1990 | 1998 |
| 10 | FAFÁ DE BELÉM | PÁSSARO SONHADOR | 1996 |
Source: AFP