Swimming at the 2007 World Aquatics Championships – Men's 800 metre freestyle Heats Heats

| Rank_ | Heat_Lane | Name_ | Nationality | Time_ |
|---|---|---|---|---|
| 13 | 4 : 6 | Marcos Rivera Miranda | Spain | 7:57.14 |
| 14 | 6 : 7 | Mads Glæsner | Denmark | 7:59.43 |
| 15 | 4 : 1 | Dragoş Coman | Romania | 7:59.91 |
| 16 | 4 : 2 | Vitaly Romanovich | Russia | 7:59.94 |
| 17 | 4 : 4 | Christian Hein | Germany | 8:00.14 |
| 18 | 6 : 5 | Nicolas Rostoucher | France | 8:03.03 |
| 19 | 5 : 7 | Maciej Hreniak | Poland | 8:05.01 |
| 20 | 5 : 8 | David Brandl | Austria | 8:05.48 |
| 21 | 3 : 4 | Ricardo Monasterio | Venezuela | 8:05.81 |
| 22 | 3 : 3 | Fernando Costa | Portugal | 8:06.44 |
| 23 | 1 : 7 | Sun Yang | China | 8:08.12 |
| 24 | 3 : 7 | Ahmed Mathlouthi | Tunisia | 8:09.59 |
| 25 | 6 : 1 | Felipe Araújo | Brazil | 8:10.50 |