| Final | time | | L | React. | bib | | 1. K. Spencer |  JAM | 54.10s | | 3 | 0.174s | 1700 | | 2. E. Child |  SCO | 55.02s | | 6 | 0.191s | 2150 | | 3. J. Russell | JAM | 55.64s | | 4 | 0.147s | 1696 | | 4. L. Wells |  AUS | 56.09s | | 5 | 0.180s | 1127 | | 5. N. Montcalm |  CAN | 56.74s | | 2 | 0.182s | 1257 | | -. C. Chase | CAN | DNF | | 8 | | 1236 | | -. A. Ogoegbunam |  NGR | DQ | | 1 | | 1975 | | -. W. Theron |  RSA | DQ | | 7 | | 2108 |
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| | | First 2 and Best 2 progressed to Final. |
| Heat 1 | time | | L | React. | bib | | 1. E. Child | SCO | 55.56s | | 5 | 0.168s | 2150 | | 2. C. Chase | CAN | 57.23s | | 7 | 0.205s | 1236 | | 3. N. Tracey | JAM | 57.63s | | 2 | 0.264s | 1706 | | 4. L. Pekin | AUS | 57.92s | | 6 | 0.218s | 1099 | | 5. E. Okoro |  ENG | 57.99s | | 1 | 0.177s | 1438 | | 6. K. Seymour |  BAH | 1:01.34 | | 4 | 0.170s | 1166 | | -. J. Lucas |  TTO | | | 3 | | 2369 |
| Heat 2 | time | | L | React. | bib | | 1. J. Russell | JAM | 56.18s | | 4 | 0.172s | 1696 | | 2. W. Theron | RSA | 56.38s | | 7 | 0.187s | 2108 | | 3. N. Montcalm | CAN | 56.72s | | 2 | 0.180s | 1257 | | 4. C. Mcmahon |  NIR | 58.67s | | 8 | 0.212s | 2003 | | 5. A. Akkunji |  IND | 58.75s | | 6 | 0.217s | 1588 | | 6. R. Abubakar |  GHA | 1:00.94 | PB | 3 | 0.174s | 1517 | | 7. S. Kwarula |  PNG | 1:02.52 | | 1 | 0.176s | 2077 | | -. H. Mclean | ENG | DQ | | 5 | | 1427 |
| Heat 3 | time | | L | React. | bib | | 1. K. Spencer | JAM | 55.45s | | 1 | 0.187s | 1700 | | 2. L. Wells | AUS | 55.79s | | 3 | 0.166s | 1127 | | 3. A. Ogoegbunam | NGR | 56.85s | | 2 | 0.163s | 1975 | | 4. J. Bellille | TTO | 57.51s | | 4 | 0.212s | 2346 | | 5. L. Wake | ENG | 58.29s | | 5 | 0.193s | 1478 | | 6. C. Merrill |  SRI | 58.65s | | 7 | 0.221s | 2281 | | 7. F. Wasike |  KEN | 59.29s | | 6 | 0.201s | 1796 |
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| Lane Heat 1 | PB | SB | bib | | 1. E. Okoro | ENG | 56.67s | 56.67s | 1438 | | 2. N. Tracey | JAM | 55.18s | 55.18s | 1706 | | 3. J. Lucas | TTO | 57.84s | 53.20s | 2369 | | 4. K. Seymour | BAH | 59.05s | 57.24s | 1166 | | 5. E. Child | SCO | 54.39s | 54.22s | 2150 | | 6. L. Pekin | AUS | 57.11s | 57.11s | 1099 | | 7. C. Chase | CAN | 56.27s | 56.27s | 1236 |
| Lane Heat 2 | PB | SB | bib | | 1. S. Kwarula | PNG | 59.77s | 59.77s | 2077 | | 2. N. Montcalm | CAN | 56.47s | 55.96s | 1257 | | 3. R. Abubakar | GHA | 1:01.37 | 1:01.37 | 1517 | | 4. J. Russell | JAM | 54.75s | 54.75s | 1696 | | 5. H. Mclean | ENG | 56.43s | 56.43s | 1427 | | 6. A. Akkunji | IND | 57.43s | 56.15s | 1588 | | 7. W. Theron | RSA | 54.82s | 54.82s | 2108 | | 8. C. Mcmahon | NIR | 56.97s | 56.97s | 2003 |
| Lane Heat 3 | PB | SB | bib | | 1. K. Spencer | JAM | 53.41s | 52.79s | 1700 | | 2. A. Ogoegbunam | NGR | 56.77s | 56.46s | 1975 | | 3. L. Wells | AUS | 55.69s | 55.08s | 1127 | | 4. J. Bellille | TTO | 55.41s | 55.41s | 2346 | | 5. L. Wake | ENG | 57.17s | 57.17s | 1478 | | 6. F. Wasike | KEN | 58.53s | 56.86s | 1796 | | 7. C. Merrill | SRI | 58.25s | 56.45s | 2281 |
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