| DFB-Pokal 1965/1966 - Appearances as Referee |  |
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 |
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| 22/01/1966 | Holstein Kiel | - | Arminia Bielefeld | 3:1 | - | - | - |
| 19/02/1966 | Tasmania 1900 Berlin | - | 1. FC Köln | 1:2 | - | - | - |
| DFB-Pokal 1965/1966 - Appearances as Referee | |
|
|
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| 22/01/1966 | Holstein Kiel | - | Arminia Bielefeld | 3:1 | - | - | - |
| 19/02/1966 | Tasmania 1900 Berlin | - | 1. FC Köln | 1:2 | - | - | - |
| Complete name: | Walter Horstmann |
| Born: | 28/08/1935 † 21/08/2015 |
| Place of birth: |
Hildesheim, 
Germany |
| Residence: | Groß Escherde |
| Nationality: |
Germany |
| Bundesliga (GER) appearances: | 144 |