Željko Sopić (born 26 July 1974) is a Croatian professional football manager and former player.

Sopić started his professional career with NK Zagreb in 1994 and spent four years with the club's first team before leaving for Bundesliga side Borussia Mönchengladbach in 1998.

He made 23 appearances and scored two goals in his only season in the German top flight.

Bundesliga, following their relegation from the first division in 1999, before moving to league rivals LR Ahlen in the summer of 2000.

He also won two international caps for the Croatian B national team, against Romania in 1998 and France in 1999.