| Men 100m Breaststroke Swimming III World Championship 1978 West Berlin - Sunday, 20th August - Gold Medal: Walter Kusch, West Germany |
| Final | | time | | gap | L | ag | 50m | | 1. Walter Kusch |  West Germany | 1:03.50 | CR | | 4 | 24 | 29.90s | | 2. Graham Smith |  Canada | 1:03.60 | NR | +0.10s | 2 | 20 | 29.46s | | 3. Gerald Morken | West Germany | 1:03.62 | | +0.12s | 8 | 18 | 29.35s | | 4. Duncan Goodhew |  Great Britain | 1:03.71 | | +0.21s | 6 | 21 | 29.69s | | 5. Nick Nevid |  United States | 1:03.84 | | +0.34s | 5 | _ | 30.29s | | 6. Shigehiro Takahashi |  Japan | 1:03.94 | NR | +0.44s | 3 | 17 | 30.70s | | 7. Steve Lundquist | United States | 1:04.11 | | +0.61s | 7 | 17 | 29.87s | | 8. Falk Becker |  East Germany | 1:05.69 | | +2.19s | 1 | _ | 30.32s |
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| World Record: Gerald Moerken, West Germany 1:02.86 29.60s | | Championship Record: John Hencken, United States 1:04.02 1973 |
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Heats - Sunday, 20th August | | Best 8 times advanced to Final>. |
| Heat 5 | | time | | gap | L | ag | Rk | | 6. Steve Lundquist | United States | 1:04.65 | | +0.93s | - | 17 | 1. | | 7. Falk Becker | East Germany | 1:05.24 | | +1.52s | - | _ | 2. | | 9. Aleksandr Fedorovsky |  Soviet Union | 1:05.60 | | +1.88s | - | 19 | 3. | | 15.Bruce Kent | Canada | 1:06.77 | | +3.05s | - | _ | 4. |
| Heat 4 | | time | | gap | L | ag | Rk | | 2. Nick Nevid | United States | 1:04.41 | | +0.69s | - | _ | 1. | | 4. Duncan Goodhew | Great Britain | 1:04.56 | | +0.84s | - | 21 | 2. | | 14.Hiroshi Kabatani | Japan | 1:06.66 | | +2.94s | - | _ | 3. | | 17.Paul Naisby | Great Britain | 1:06.85 | | +3.13s | - | 23 | 4. | | 24.Miguel Santisteban |  Mexico | 1:08.44 | | +4.72s | - | 18 | 5. | | 30.Ronald Hond |  Netherlands | 1:09.50 | | +5.78s | - | _ | 6. | | 34.Hassan |  Tunisia | 1:13.87 | | +10.15s | - | _ | 7. |
| Heat 3 | | time | | gap | L | ag | Rk | | 3. Shigehiro Takahashi | Japan | 1:04.48 | | +0.76s | - | 17 | 1. | | 10.Arsens Miskarovs | Soviet Union | 1:05.81 | | +2.09s | - | 17 | 2. | | 19.Pablo Restrepo |  Colombia | 1:06.91 | NR | +3.19s | - | 18 | 3. |
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| Heat 2 | | time | | gap | L | ag | Rk | | 5. Graham Smith | Canada | 1:04.60 | | +0.88s | - | 20 | 1. | | 8. Gerald Morken | West Germany | 1:05.31 | | +1.59s | - | 18 | 2. | | 13.Glen Christiansen |  Sweden | 1:06.65 | | +2.93s | - | 21 | 3. |
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| Heat 1 | | time | | gap | L | ag | Rk | | 1. Walter Kusch | West Germany | 1:03.72 | CR | | - | 24 | 1. | | 11.Dec Sjostrom | Sweden | 1:06.23 | NR | +2.51s | - | _ | 2. | | 12.Gregor Arnicke | East Germany | 1:06.40 | | +2.68s | - | _ | 3. |
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| Heat - | | time | | gap | L | ag | Rk | | 16.Giorgio Lalle |  Italy | 1:06.83 | | +3.11s | - | 21 | | | 18.Olivier Borios |  France | 1:06.88 | | +3.16s | - | 19 | | | 20.Alban Vermes |  Hungary | 1:07.05 | NR | +3.33s | - | 21 | | | 21.Lindsay Spencer |  Australia | 1:07.46 | | +3.74s | - | 16 | | | 22.Helmuth Levy | Colombia | 1:08.18 | | +4.46s | - | 19 | | | 23.Steffen Kriechbaum |  Austria | 1:08.28 | | +4.56s | - | 31 | | | 25.Ron Kehrmann |  Israel | 1:08.64 | | +4.92s | - | _ | | | 26.Kun Hantiyo Prastiasto |  Indonesia | 1:08.65 | NR | +4.93s | - | _ | | | 27.Georgy Dangalakov |  Bulgaria | 1:09.01 | | +5.29s | - | _ | | | 28.Orlando Catinchi |  Puerto Rico | 1:09.29 | | +5.57s | - | 21 | | | 29.Roberto Neiger |  Switzerland | 1:09.39 | | +5.67s | - | _ | | | 31.Andres Aguilar |  Costa Rica | 1:11.30 | NR | +7.58s | - | 17 | | | 32.Luis Bajana |  Ecuador | 1:11.59 | | +7.87s | - | - | | | 33.Daniel Pinargote | Ecuador | 1:12.68 | | +8.96s | - | _ | | | 35.Hamad Karam |  Kuwait | 1:20.87 | | +17.15s | - | _ | | | -. Mohamed Abbas | Kuwait | DSQ | | - | - | _ | | | -. Behzad Rahlmian |  IRI | DNS | | - | - | _ | | | Heat - | | time | | gap | L | ag | Rk |
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