The two sides are expected to discuss issues such as the return of refugees and the search for people missing since Croatia's war for independence from the former Yugoslav federation.
Marovic is also scheduled to meet with Prime Minister Ivo Sanader and other political leaders.
Croatia's minority Serbs, backed by the Serb-dominated Yugoslav army, rebelled against Croatia's secession from Yugoslavia in 1991. More than 10,000 people were killed and hundreds of thousands were driven from their homes. The fighting ended in 1995, after Croatian forces recaptured territory seized by rebels.