Portugal - National Lower House Elections (1975)
| Party | Votes | Vote Percentage | Seats |
| P8-Democratic Social Center Party | 433772 | 8.20% | 16 |
| P53-Popular Democratic Union | 44877 | 0.85% | 1 |
| P51-Party of Popular Unity | 13138 | 0.25% | 0 |
| P46-Socialist Party | 2154149 | 40.71% | 115 |
| P42-Popular Monarchal Party | 32482 | 0.61% | 0 |
| P40-Popular Democratic Party | 1498897 | 28.33% | 80 |
| P25-Portuguese Communist Party | 711925 | 13.45% | 30 |
| P19-Socialist Left Movement | 58248 | 1.10% | 0 |
| P17-Portuguese Democratic Movement | 234293 | 4.43% | 5 |
| P15-Communist International League | 10835 | 0.20% | 0 |
| P14-Popular Socialist Front | 66307 | 1.25% | 0 |
| P11-Communist Electoral Front | 32700 | 0.62% | 0 |
| TOTAL | 5291623 | 247 |
See the Global Elections Database codebook for further information about the election results.