The best selling album in 1978 in Portugal was SATURDAY NIGHT FEVER (SOUNDTRACK) by BEE GEES.
| Rank | Artist | Album | Released |
| 1 | BEE GEES | SATURDAY NIGHT FEVER (SOUNDTRACK) | 1977 |
| 2 | KATE BUSH | THE KICK INSIDE | 1978 |
| 3 | SOUNDTRACK | O CASARÃO | 1978 |
| 4 | QUEEN | NEWS OF THE WORLD | 1977 |
| 5 | THE ROLLING STONES | SOME GIRLS | 1978 |
| 6 | GENESIS | AND THEN THERE WERE THREE | 1978 |
| 7 | VARIOUS ARTISTS | 30 SUCESSOS EXPLOSIVOS | 1978 |
| 8 | SPACE | DELIVERANCE | 1978 |
| 9 | SOUNDTRACK | GREASE | 1978 |
| 10 | GRACE JONES | PORTFOLIO | 1978 |
Source: Música & Som