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| Type | Daily newspaper |
|---|---|
| Format | Broadsheet |
| Owner(s) | Eduardo Costa |
| Founded | 1868 |
| Political alignment | Left-liberal |
| Language | Portuguese |
| Headquarters | Porto |
| ISSN | 0873-6448 |
| Website | https://oprimeirodejaneiro.com.pt/ |
O Primeiro de Janeiro (lit. the first of January) was a Portuguese daily newspaper published in Porto, Portugal.