The most successful Željezničar manager in terms of trophies won is Amar Osim, who won five Bosnian Premier League titles, four Bosnian Cups and one Bosnian Supercup.
Amar Osim holds the record for the most successful tenure as Željezničar manager, boasting an impressive collection of titles, including five Bosnian Premier League crowns, four Bosnian Cup victories, and a single Bosnian Supercup triumph.