| Champ: |  Rafael Nadal |
| Runner: | Nicolás Almagro |
| Score: | 6–4, 6–3 |
| Type: | singles doubles |
| Draw: | 48 (6 / 4) |
| Seeds: | 16 |
| Before Name: | Barcelona Open Banco Sabadell – Singles |
| After Name: | Barcelona Open Banc Sabadell – Singles |
| Main Name: | Barcelona Open (tennis) Barcelona Open |
See main article: 2013 Barcelona Open Banco Sabadell.
Two-time defending champion Rafael Nadal defeated Nicolás Almagro in the final, 6–4, 6–3 to win the singles tennis title at the 2013 Barcelona Open. It was his record-extending eighth Barcelona Open title.
All seeds receive a bye into the second round.