OK Napredak Odžak (also HOK Napredak) is a volleyball club from Odžak, Bosnia and Herzegovina. It currently competes in the Premier League of Volleyball of Bosnia and Herzegovina. It was formed in 1973.
The modern club, reestablished by Bosnian Croats after the nation's war, was formed in 1997 and played in the Croatian Herzeg-Bosnia First League of Volleyball. By 2000, the club became champions of the league.
In 2001, the club joined the Volleyball Federation of Bosnia and Herzegovina and began to play in the new national league. In its first season competing, 2001-2002, Napredak was national champion and has been one of the top clubs since, as champions again in 2006-2007 and finishing third in 2007-2008 and second in 2008-2009 and 2009-2010.
Napredak's fans are known as the Uragan. Currently, the club plays its matches near Modriča while an arena is being built in Odžak itself.