Men 800 m
Heat 1
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 3 | Billy Konchellah | KEN | 1:47.35 | Q |
| 2 | 2 | Mark Everett | USA | 1:47.37 | Q |
| 3 | 1 | Tom McKean | GBR | 1:47.38 | |
| 4 | 4 | Desta Asgedom | ETH | 1:48.28 | |
| 5 | 5 | Fabian Franco | GIB | 1:54.29 | |
| 6 | 6 | Charles Nkazamyampi | BUR | 4:13.28 | |
| 7 | Ismael Youssef | QAT | DQ |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 1 | Paul Ereng | KEN | 1:45.94 | Q |
| 2 | 5 | Tomás de Teresa | ESP | 1:46.41 | Q |
| 3 | 4 | Slobodan Popovic | YUG | 1:46.89 | |
| 4 | 7 | Valeriy Starodubtsev | URS | 1:47.55 | |
| 5 | 2 | Ari Suhonen | FIN | 1:48.15 | |
| 6 | 6 | Luis Martinez | GUA | 1:49.07 | |
| 3 | Ibrahim Okash | SOM | DNS |
Heat 3
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 1 | Robert Kibet | KEN | 1:50.13 | Q |
| 2 | 4 | Brian Whittle | GBR | 1:50.30 | Q |
| 3 | 7 | Luis Javier González | ESP | 1:50.46 | |
| 4 | 3 | Reda Abdenouz | ALG | 1:50.47 | |
| 5 | 2 | Pablo Squella | CHI | 1:50.92 | |
| 6 | 6 | Luis Migueles | ARG | 1:51.42 | |
| 7 | 5 | Samson Vallabouy | MAS | 1:51.46 |
Heat 4
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 1 | George Kersh | USA | 1:47.00 | Q |
| 2 | 3 | Frédéric Cornette | FRA | 1:47.02 | Q |
| 3 | 5 | Ahmed Belkessam | ALG | 1:47.06 | |
| 4 | 7 | Esko Parpala | FIN | 1:47.28 | |
| 5 | 2 | Babacar Niang | SEN | 1:47.75 | |
| 6 | 4 | Dale Jones | ANT | 1:48.62 | |
| 6 | Dieudonné Kwizera | BUR | DNS |
Heat 5
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 3 | José Luiz Barbosa | BRA | 1:45.68 | Q |
| 2 | 1 | Freddie Williams | CAN | 1:45.83 | Q |
| 3 | 2 | Mbiganyi Thee | BOT | 1:45.94 | q |
| 4 | 5 | Joachim Dehmel | GER | 1:46.24 | q |
| 5 | 4 | Steve Heard | GBR | 1:46.29 | q |
| 6 | 7 | Tommy Asinga | SUR | 1:47.33 | |
| 6 | João N'Tyamba | ANO | DQ |
Heat 6
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 7 | Johnny Gray | USA | 1:46.59 | Q |
| 2 | 3 | Piotr Piekarski | POL | 1:46.63 | Q |
| 3 | 4 | Andrey Sudnik | URS | 1:46.77 | q |
| 4 | 1 | Giuseppe D'Urso | ITA | 1:46.82 | |
| 5 | 2 | Markus Trinkler | SUI | 1:47.67 | |
| 6 | 5 | Antonio Abrantes | POR | 1:47.91 | |
| 7 | 6 | Douglas Kalembo | ZAM | 1:48.26 |
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 1 | Billy Konchellah | KEN | 1:46.86 | Q |
| 2 | 8 | Mark Everett | USA | 1:46.96 | Q |
| 3 | 6 | Johnny Gray | USA | 1:47.04 | Q |
| 4 | 5 | Piotr Piekarski | POL | 1:47.14 | Q |
| 5 | 3 | Freddie Williams | CAN | 1:47.17 | |
| 6 | 2 | Robert Kibet | KEN | 1:47.36 | |
| 7 | 7 | Frédéric Cornette | FRA | 1:48.04 | |
| 8 | 4 | Steve Heard | GBR | 1:49.91 |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 5 | José Luiz Barbosa | BRA | 1:45.14 | Q |
| 2 | 6 | Paul Ereng | KEN | 1:45.42 | Q |
| 3 | 4 | Tomás de Teresa | ESP | 1:45.84 | Q |
| 4 | 8 | Andrey Sudnik | URS | 1:45.91 | Q |
| 5 | 1 | George Kersh | USA | 1:45.98 | |
| 6 | 3 | Mbiganyi Thee | BOT | 1:46.30 | |
| 7 | 2 | Joachim Dehmel | GER | 1:47.91 | |
| 8 | 7 | Brian Whittle | GBR | 1:54.14 |
| Pos | Lane | Athlete | NOC | Mark |
| 1 | 7 | Billy Konchellah | KEN | 1:43.99 |
| 2 | 5 | José Luiz Barbosa | BRA | 1:44.24 |
| 3 | 1 | Mark Everett | USA | 1:44.67 |
| 4 | 3 | Paul Ereng | KEN | 1:44.75 |
| 5 | 2 | Piotr Piekarski | POL | 1:45.44 |
| 6 | 8 | Johnny Gray | USA | 1:45.67 |
| 7 | 6 | Andrey Sudnik | URS | 1:46.36 |
| 8 | 4 | Tomás de Teresa | ESP | 1:47.65 |
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 4 | Ella Kovacs | ROM | 2:01.06 | Q |
| 2 | 7 | Ann Williams | GBR | 2:01.44 | Q |
| 3 | 3 | Maria Magnólia Figueiredo | BRA | 2:01.71 | q |
| 4 | 2 | Joetta Clark | USA | 2:01.81 | q |
| 5 | 6 | Tuuli Merikoski | FIN | 2:03.84 | |
| 6 | 1 | Gabriella Dorio | ITA | 2:07.54 | |
| 7 | 5 | Nana-Kadidia Thera | MLI | 2:30.77 |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 6 | Svetlana Masterkova | URS | 2:04.52 | Q |
| 2 | 1 | Charmaine Crooks | CAN | 2:04.60 | Q |
| 3 | 4 | Meredith Rainey-Valmon | USA | 2:04.84 | |
| 4 | 5 | Mitica Junghiatu-Constantin | ROM | 2:06.53 | |
| 5 | 2 | Sharon Stewart | AUS | 2:08.72 | |
| 6 | 3 | Angelina Mantokoane Pitso | LES | 2:24.63 | |
| 7 | Shermaine Ross | GRN | DNS |
Heat 3
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 2 | Maria Lurdes Mutola | MOZ | 2:00.86 | Q |
| 2 | 3 | Ana Fidelia Quirot | CUB | 2:00.88 | Q |
| 3 | 7 | Sigrun Wodars-Grau | GER | 2:00.99 | q |
| 4 | 6 | Maria Akraka | SWE | 2:02.58 | |
| 5 | 5 | Maite Zúñiga | ESP | 2:03.24 | |
| 6 | 1 | Edith Nakiyingi | UGA | 2:05.19 | |
| 4 | Dawn Williams-Sewer | DMN | DNS |
Heat 4
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 7 | Delisa Walton-Floyd | USA | 2:00.05 | Q |
| 2 | 6 | Birthe Bruhns | GER | 2:00.11 | Q |
| 3 | 1 | Liliya Nurutdinova | URS | 2:00.13 | q |
| 4 | 2 | Lorraine Baker | GBR | 2:01.22 | q |
| 5 | 3 | Ellen Van Langen | NED | 2:02.02 | |
| 6 | 4 | Aisling Molloy | IRL | 2:02.31 | |
| 7 | 5 | Sharmaine Williams | TKS | 3:00.97 |
Heat 5
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 2 | Christine Wachtel | GER | 2:01.45 | Q |
| 2 | 5 | Letitia Vriesde | SUR | 2:01.51 | Q |
| 3 | 3 | Milena Matejkovicova-Strnadova | TCH | 2:01.95 | q |
| 4 | 4 | Inna Yevseyeva | URS | 2:03.09 | |
| 5 | 6 | Tudorita Chidu | ROM | 2:03.81 | |
| 6 | 1 | Elsa Amaral | POR | 2:03.83 | |
| 7 | 7 | Paula Fryer | GBR | 2:04.64 | |
| 8 | 8 | Sylene Blake | MNT | 2:51.71 |
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 4 | Ana Fidelia Quirot | CUB | 2:00.08 | Q |
| 2 | 5 | Ella Kovacs | ROM | 2:00.13 | Q |
| 3 | 6 | Liliya Nurutdinova | URS | 2:00.13 | Q |
| 4 | 8 | Ann Williams | GBR | 2:00.30 | Q |
| 5 | 1 | Milena Matejkovicova-Strnadova | TCH | 2:00.47 | |
| 6 | 2 | Maria Magnólia Figueiredo | BRA | 2:01.53 | |
| 7 | 3 | Joetta Clark | USA | 2:02.35 | |
| 7 | Sigrun Wodars-Grau | GER | DNS |
Heat 2
| Pos | Lane | Athlete | NOC | Mark | |
| 1 | 5 | Christine Wachtel | GER | 1:59.10 | Q |
| 2 | 3 | Letitia Vriesde | SUR | 1:59.15 | Q |
| 3 | 4 | Svetlana Masterkova | URS | 1:59.15 | Q |
| 4 | 8 | Maria Lurdes Mutola | MOZ | 1:59.29 | Q |
| 5 | 1 | Birthe Bruhns | GER | 1:59.93 | |
| 6 | 6 | Charmaine Crooks | CAN | 2:00.63 | |
| 7 | 2 | Lorraine Baker | GBR | 2:01.32 | |
| 8 | 7 | Delisa Walton-Floyd | USA | 2:01.32 |
| Pos | Lane | Athlete | NOC | Mark |
| 1 | 7 | Liliya Nurutdinova | URS | 1:57.50 |
| 2 | 2 | Ana Fidelia Quirot | CUB | 1:57.55 |
| 3 | 8 | Ella Kovacs | ROM | 1:57.58 |
| 4 | 3 | Maria Lurdes Mutola | MOZ | 1:57.63 |
| 5 | 6 | Letitia Vriesde | SUR | 1:58.25 |
| 6 | 4 | Christine Wachtel | GER | 1:58.90 |
| 7 | 1 | Ann Williams | GBR | 2:01.01 |
| 8 | 5 | Svetlana Masterkova | URS | 2:02.92 |
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