|Type||Competed in Olympic Games|
|Born||15 June 1892 in Wien (Vienna) (AUT)|
|Affiliations||WAC, Wien (AUT)|
Karl Hack qualified for the 1912 Olympics when he won the marathon Kagran-Gänserndorf-Süssenbrunn (40.2 km) in a time of 3-08:01.6 on 9 June 1912. This was also his only Austrian title.
Personal Best: Mar – unknown.
|Games||Discipline (Sport) / Event||NOC / Team||Pos||Medal||As|
|1912 Summer Olympics||Athletics||AUT||Karl Hack|
|5,000 metres, Men (Olympic)||DNS|
|10,000 metres, Men (Olympic)||DNS|
|Marathon, Men (Olympic)||AC|