Josef Karas (born 20 August 1978 in Olomouc, Czechoslovakia, now Czech Republic) is a Czech male decathlete.
He previously represented Canada.
He set his personal best score (7922 points) in the men's decathlon on 20 June 2007 in Kladno.
Karas is a two-time national champion in the men's decathlon (2005 and 2006).
This biographical article relating to Czech athletics is a stub.