Slavko Ištvanić (born 12 July 1966 in Zagreb) is a retired Croatian professional footballer who played over 200 league matches for NK Dinamo Zagreb in the Croatian Prva HNL.
Ištvanić made his debut for Croatia in a June 1991 friendly match against Slovenia and earned a total of 3 caps, scoring no goals.
His first was not official, though, since Croatia was still part of Yugoslavia at the time.
His final international was an April 1994 friendly away against Slovakia.
This biographical article related to a football defender from Croatia is a stub.