| Date | 30 July 1980 — 10:00 | |
|---|---|---|
| Status | Olympic | |
| Location | Dvorets sporta, Tsentralny stadion imeni V. I. Lenina, Moskva | |
| Participants | 30 from 30 countries | |
| Format | Two single-elimination pools, with winner of each pool advanced to the final. All judoka losing to the winner of each pool advanced to repêchage pools, with the winners of the repêchage pools earning bronze medals. | |
Great Britain’s Neil Adams had won the European Championship at half-middleweight earlier in the year. But he was also bronze medalist in lightweight at the 1979 World Championships. When he dropped back to lightweight for the Olympics, he assumed the favorite’s role in the absence of Japanese World Champion, Kiyoto Katsuki. He was expected to be challenged by Italy’s Ezio Gamba, runner-up at the 1979 Worlds, who was a soldier in the Italian Army. Italy did not boycott Moskva, but their soldiers were forbidden to compete. So Gamba dropped out of the Army and travelled to Moskva on his own, the only Italian judo player in 1980. In the early rounds, Adams looked unbeatable, winning all his matches by ippon. Gamba was less impressive but came thru to the final. The final was extremely close, but at the 7-minute limit, the referee called for hantei and both judges raised the white flag, indicating Gamba, who won the gold medal.
| Date | 30 July 1980 |
|---|
| Date | 30 July 1980 |
|---|
| Match | Date/Time | Competitor | NOC | Result | Competitor | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 30 Jul | Alonzo Henderson | IRL | bye | |||
| Match #2 | 30 Jul | Niokhor Diongue | SEN | Ippon | Roukoz Roukoz | LBN | |
| Match #3 | 30 Jul | Seppo Myllylä | FIN | Ippon | Cornel Roman | ROU | |
| Match #4 | 30 Jul | Karl-Heinz Lehmann | GDR | Yuko | Johann Leo | AUT | |
| Match #5 | 30 Jul | Halldór Guðbjörnsson | ISL | Ippon | Paul Diop | MLI | |
| Match #6 | 30 Jul | Edward Alkśnin | POL | Ippon | Anelson Vieira | BRA | |
| Match #7 | 30 Jul | Maurice Nkamden | CMR | Sogo-gachi | George Hamaiko | ZAM | |
| Match #8 | 30 Jul | Neil Adams | GBR | Ippon | Michael Picken | AUS |
| Date | 30 July 1980 |
|---|
| Match | Date/Time | Competitor | NOC | Result | Competitor | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 30 Jul | Niokhor Diongue | SEN | Waza-ari | Alonzo Henderson | IRL | |
| Match #2 | 30 Jul | Karl-Heinz Lehmann | GDR | Yuko | Seppo Myllylä | FIN | |
| Match #3 | 30 Jul | Edward Alkśnin | POL | Waza-ari awasete ippon | Halldór Guðbjörnsson | ISL | |
| Match #4 | 30 Jul | Neil Adams | GBR | Fusen-gachi | Maurice Nkamden | CMR | walkover |
| Date | 30 July 1980 |
|---|
| Match | Date/Time | Competitor | NOC | Result | Competitor | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 30 Jul | Karl-Heinz Lehmann | GDR | Ippon | Niokhor Diongue | SEN | |
| Match #2 | 30 Jul | Neil Adams | GBR | Waza-ari awasete ippon | Edward Alkśnin | POL |
| Date | 30 July 1980 |
|---|
| Match | Date/Time | Competitor | NOC | Result | Competitor | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 30 Jul | Neil Adams | GBR | Ippon | Karl-Heinz Lehmann | GDR |
| Date | 30 July 1980 |
|---|
| Match | Date/Time | Competitor | NOC | Result | Competitor | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 30 Jul | Edward Alkśnin | POL | Koka | Michael Picken | AUS | |
| Match 3/5 | 30 Jul | Karl-Heinz Lehmann | GDR | Yuko | Edward Alkśnin | POL |
| Date | 30 July 1980 |
|---|
| Date | 30 July 1980 |
|---|
| Match | Date/Time | Competitor | NOC | Result | Competitor | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 30 Jul | Ravdangiin Davaadalai | MGL | Ippon | Abdoulaye Diallo | GUI | |
| Match #2 | 30 Jul | Tamaz Namgalauri | URS | Ippon | Manuel Chávez | CRC | |
| Match #3 | 30 Jul | Ronny Nilsson | SWE | Ippon | Neofitos Aresti | CYP | |
| Match #4 | 30 Jul | Ricardo Tuero | CUB | Waza-ari | Issam Tombakji | SYR | |
| Match #5 | 30 Jul | Ezio Gamba | ITA | Ippon | Fahad Al-Farhan | KUW | |
| Match #6 | 30 Jul | Christian Dyot | FRA | Yuko | Vojo Vujević | YUG | |
| Match #7 | 30 Jul | Kim Byong-Gun | PRK | Yuko | Djillali Ben Brahim | ALG | |
| Match #8 | 30 Jul | Károly Molnár | HUN | bye |
| Date | 30 July 1980 |
|---|
| Match | Date/Time | Competitor | NOC | Result | Competitor | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 30 Jul | Ravdangiin Davaadalai | MGL | Koka | Tamaz Namgalauri | URS | |
| Match #2 | 30 Jul | Ricardo Tuero | CUB | Ippon | Ronny Nilsson | SWE | |
| Match #3 | 30 Jul | Ezio Gamba | ITA | Yusei-gachi | Christian Dyot | FRA | |
| Match #4 | 30 Jul | Kim Byong-Gun | PRK | Yusei-gachi | Károly Molnár | HUN |
| Date | 30 July 1980 |
|---|
| Match | Date/Time | Competitor | NOC | Result | Competitor | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 30 Jul | Ravdangiin Davaadalai | MGL | Ippon | Ricardo Tuero | CUB | |
| Match #2 | 30 Jul | Ezio Gamba | ITA | Ippon | Kim Byong-Gun | PRK |
| Date | 30 July 1980 |
|---|
| Match | Date/Time | Competitor | NOC | Result | Competitor | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 30 Jul | Ezio Gamba | ITA | Ippon | Ravdangiin Davaadalai | MGL |
| Date | 30 July 1980 |
|---|
| Match | Date/Time | Competitor | NOC | Result | Competitor | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 30 Jul | Christian Dyot | FRA | Ippon | Fahad Al-Farhan | KUW | |
| Match #2 | 30 Jul | Christian Dyot | FRA | Yusei-gachi | Kim Byong-Gun | PRK | |
| Match 3/5 | 30 Jul | Ravdangiin Davaadalai | MGL | Koka | Christian Dyot | FRA |
| Date | 30 July 1980 |
|---|
| Match | Date/Time | Competitor | NOC | Result | Competitor | NOC | |
|---|---|---|---|---|---|---|---|
| Match 1/2 | 30 Jul | Ezio Gamba | ITA | Yusei-gachi | Neil Adams | GBR |