Mladen Žganjer is a former Croatian football player.
Born in Rijeka, as a goalkeeper he spent much of his career with HNK Rijeka, playing in both the Yugoslav First League and Prva HNL.
During the 1993-94 Prva HNL season he did not concede a goal for 622 minutes, making him the club's record holder in top tier competitions.
Before finishing his career, he played for SV Spittal in Austria, before returning to Croatia, where he played for NK Pomorac Kostrena.