The best selling compilation album in 2004 in Portugal was NOW 10 by NOW SERIES (PORTUGAL).
| Rank | Artist | Album | Released |
| 1 | NOW SERIES (PORTUGAL) | NOW 10 | 2004 |
| 2 | MORANGOS COM ACUCAR SERIES | MORANGOS COM AÇUCAR | 2004 |
| 3 | VARIOUS ARTISTS | SUMMER JAM 2004 | 2004 |
| 4 | CAROCHINHA | AS MUSICAS DA CAROCHINHA VOL. 2 | 2004 |
| 5 | MORANGOS COM ACUCAR SERIES | MORANGOS DE VERÃO | 2004 |
| 6 | NOW SERIES (PORTUGAL) | NOW 11 | 2004 |
| 7 | VARIOUS ARTISTS | DISCOS PEDIDOS | 2004 |
| 8 | VARIOUS ARTISTS | DANCE POWER 10 | 2004 |
| 9 | CAROCHINHA | AS MÚSICAS DA CAROCHINHA | 2003 |
| 10 | SOUNDTRACK | NEW WAVE | 2003 |
Source: AFP