Swimming at the 2010 Summer Youth Olympics – Mixed 4 × 100 metre freestyle relay
# Swimming at the 2010 Summer Youth Olympics – Mixed 4 × 100 metre freestyle relay

The mixed 4 × 100 metre freestyle relay event at the 2010 Youth Olympic Games took place on August 15, at the Singapore Sports School.

## Medalists

| China | 3:31.34 |
| - | - |
| Australia | 3:31.69 |
| France | 3:35.90 |

## Heats

### Heat 1

| Rank | Lane | Nationality | Time | Notes |
| - | - | - | - | - |
| 1 | 5 | China | 3:39.39 | Q |
| 2 | 4 | Hong Kong | 3:40.34 | Q |
| 3 | 6 | Serbia | 3:41.15 | |
| 4 | 3 | Italy | 3:42.44 | |
| - | 2 | Spain | - | DSQ |

### Heat 2

| Rank | Lane | Nationality | Time | Notes |
| - | - | - | - | - |
| 1 | 5 | Canada | 3:36.80 | Q |
| 2 | 4 | France | 3:37.03 | Q |
| 3 | 7 | United States | 3:38.89 | Q |
| 4 | 6 | Russia | 3:39.69 | Q |
| 5 | 2 | South Africa | 3:43.85 | |
| 6 | 3 | Iceland | 3:49.60 | |

### Heat 3

| Rank | Lane | Nationality | Time | Notes |
| - | - | - | - | - |
| 1 | 4 | Australia | 3:34.67 | Q |
| 2 | 3 | Germany | 3:38.69 | Q |
| 3 | 5 | Brazil | 3:41.07 | |
| 4 | 2 | Singapore | 3:42.88 | |
| 5 | 6 | Japan | 3:49.23 | |
| 6 | 7 | Trinidad and Tobago | 3:51.35 | |

## Final

| Rank | Lane | Nationality | Time |
| - | - | - | - |
| | 7 | China | 3:31.34 |
| | 4 | Australia | 3:31.69 |
| | 3 | France | 3:35.90 |
| 4 | 5 | Canada | 3:36.05 |
| 5 | 6 | Germany | 3:36.06 |
| 6 | 2 | United States | 3:39.08 |
| 7 | 8 | Hong Kong | 3:40.08 |
| 8 | 1 | Russia | 3:42.63 |
