Olaf Janßen (born 8 October 1966) is a retired German footballer and manager of Viktoria Köln, who played as a midfielder.

Janßen spent most of his playing career with German Bundesliga sides 1.

In September 2013 he was appointed as manager of Dynamo Dresden, but was sacked after nine months on the job.

[5] In January 2018 he became new manager of FC Viktoria Köln replacing Marco Antwerpen.

[7] Janßen played for West Germany at the 1988 Summer Olympics in Seoul.