Hassan Ahmed had a lengthy career as a volleyball referee before becoming a senior administrative figure in the sport. During the 1970s and 1980s Ahmed officiated at multiple international tournaments, including three Olympic Games. After refereeing in two matches at the 1976 Montréal Games, he then oversaw multiple matches at both the Los Angeles and Seoul Olympics. In 2001 he became the President of the refereeing commission of the African Volleyball Confederation. Ahmed then served in the same role for the International Volleyball Federation from 2012 until 2016.
| Games | Sport (Discipline) / Event | NOC / Team | Phase | Unit | Role | As | |
|---|---|---|---|---|---|---|---|
| 1976 Summer Olympics | Volleyball (Volleyball) |  EGY |
Hassan Ahmed | ||||
| Volleyball, Men (Olympic) | Match #1 | Republic of Korea — Brazil | Referee #2 | ||||
| Volleyball, Women (Olympic) | Match #6 | Japan — Canada | Referee #2 | ||||
| 1984 Summer Olympics | Volleyball (Volleyball) | EGY |
Hassan Ahmed | ||||
| Volleyball, Men (Olympic) | Match 5/6 | Republic of Korea — Argentina | Referee #2 | ||||
| Volleyball, Men (Olympic) | Match #2 | Argentina — Japan | Referee #2 | ||||
| Volleyball, Men (Olympic) | Match #8 | Republic of Korea — Brazil | Referee #2 | ||||
| Volleyball, Men (Olympic) | Match #9 | Republic of Korea — Argentina | Referee #2 | ||||
| Volleyball, Women (Olympic) | Match 5/6 | Republic of Korea — West Germany | Referee #2 | ||||
| Volleyball, Women (Olympic) | Match #1 | West Germany — Canada | Referee #1 | ||||
| Volleyball, Women (Olympic) | Match #6 | Japan — Canada | Referee #1 | ||||
| 1988 Summer Olympics | Volleyball (Volleyball) | EGY |
Hassan Ahmed | ||||
| Volleyball, Men (Olympic) | Match 1/2 | United States — Soviet Union | Referee #2 | ||||
| Volleyball, Men (Olympic) | Match #2 | Soviet Union — Argentina | Referee #2 | ||||
| Volleyball, Men (Olympic) | Match #1 | Sweden — Republic of Korea | Referee #1 | ||||
| Volleyball, Men (Olympic) | Match #7 | Brazil — Bulgaria | Referee #1 | ||||
| Volleyball, Men (Olympic) | Match #13 | Italy — Republic of Korea | Referee #1 | ||||
| Volleyball, Men (Olympic) | Match #6 | Argentina — Japan | Referee #2 | ||||
| Volleyball, Men (Olympic) | Match #12 | Argentina — Netherlands | Referee #2 | ||||
| Volleyball, Women (Olympic) | Match 1/2 | Soviet Union — Peru | Referee #1 | ||||
| Volleyball, Women (Olympic) | Match #1 | Brazil — Republic of Korea | Referee #2 | ||||
| Volleyball, Women (Olympic) | Match #5 | Soviet Union — East Germany | Referee #1 |
