Swimming at the 1986 Commonwealth Games – Men's 4 × 100 metre medley relay
The men's 4 × 100 metre medley relay competition of the swimming events at the 1986 Commonwealth Games took place on 30 July.
Records
Prior to the competition, the existing world and championship records were as follows.The following records were established during the competition:
| Date | Event | Nation | Athletes | Time | Record |
| 30 July 1986 | Final | Mark Tewksbury Victor Davis Tom Ponting Alex Baumann | 3:44.00 | GR |
Results
Heats
9 teams participated in 2 heats.| Rank | Heat | Lane | Nation | Athletes | Time | Notes |
| 1 | 1 | - | Carl Wilson Brett Stocks Barry Armstrong Greg Fasala | 3:53.67 | Q | |
| 2 | 2 | - | Mike West Darcy Wallingford Claude Lamy Sandy Goss | 3:54.77 | Q | |
| 3 | 1 | - | Paul Kingsman Grant Forbes Anthony Mosse Ross Anderson | 3:54.84 | Q | |
| 4 | 2 | - | Neil Harper Nick Gillingham Andy Jameson Roland Lee | 3:54.90 | Q | |
| 5 | 2 | - | Craig Nelson Gary Watson Richard Leishman Colin Bole | 4:02.86 | Q | |
| 6 | 1 | - | David Lim Jin Teik Oon Ang Peng Siong Jin Gee Oon | 4:03.02 | Q | |
| 7 | 2 | - | Hor Man Yip Michael Watt Yi Ming Tsang Johnny Li | 4:05.22 | Q | |
| 8 | 1 | - | Ian Rosser Bruce Perry Steven Gwynne Gareth Williams | 4:09.56 | Q | |
| 9 | 2 | - | Yul Du Pont Chris Stapley Shan Nissiotis Trevor Ncala | 4:34.43 |
Final
The results of the final are below.| Rank | Lane | Nation | Athletes | Time | Notes |
| 5 | Mark Tewksbury Victor Davis Tom Ponting Alex Baumann | 3:44.00 | |||
| 6 | Neil Harper Adrian Moorhouse Andy Jameson Roland Lee | 3:44.85 | |||
| 4 | Carl Wilson Brett Stocks Barry Armstrong Greg Fasala | 3:45.86 | |||
| 3 | Paul Kingsman Grant Forbes Anthony Mosse Ross Anderson | 3:48.58 | |||
| 2 | Craig Nelson Gary Watson Richard Leishman Colin Bole | 3:54.05 | |||
| 7 | David Lim Jin Teik Oon Ang Peng Siong Jin Gee Oon | 3:56.99 | |||
| 1 | Hor Man Yip Michael Watt Yi Ming Tsang Johnny Li | 4:00.29 | |||
| 8 | Ian Rosser Bruce Perry Steven Gwynne Gareth Williams | 4:07.54 |