Swimming at the 2008 Summer Olympics – Women's 4 × 100 metre medley relay Heats Heats

| Rank_ | Heat | Lane | Nationality | Time_ |
|---|---|---|---|---|
| 1 | 2 | 4 | Australia | 3:57.94 |
| 2 | 2 | 5 | Great Britain | 3:59.14 |
| 3 | 1 | 4 | United States | 3:59.15 |
| 4 | 1 | 5 | China | 3:59.21 |
| 5 | 2 | 3 | Russia | 3:59.66 |
| 6 | 1 | 3 | Japan | 3:59.91 |
| 7 | 2 | 7 | Sweden | 4:02.12 |
| 8 | 2 | 2 | Canada | 4:02.13 |
| 9 | 1 | 8 | Germany | 4:02.53 |
| 10 | 1 | 2 | Brazil | 4:02.61 |
| 11 | 1 | 1 | France | 4:02.95 |
| 12 | 2 | 6 | South Africa | 4:04.20 |
| 13 | 1 | 6 | Netherlands | 4:04.74 |
| 14 | 2 | 8 | Italy | 4:04.93 |
| 15 | 1 | 7 | Spain | 4:06.40 |
| 16 | 2 | 1 | Ukraine | 4:08.62 |