The 1998–99 Trabzonspor season was the 24th consecutive season that the club played in the 1. Lig.
Season summary
Trabzonspor finished 4th the 1998–99 season. Trabzonspor was included in the Turkish Cup from 6th round. Trabzonspor played against Gaziantepspor in the 6th round. Trabzonspor won the 1st game 5 - 4 against Gaziantepspor but lost 2nd game 3 - 1 and eliminated from the Turkish Cup. Trabzonspor participated UEFA Cup in the 1998–99 season. In the 1st game of the 1st leg Trabzonspor lost 5 - 1 against Wisła Kraków in Kraków. Trabzonspor also lost the 2nd leg 2 - 1 in Trabzon and eliminated from UEFA Cup
Squad
Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
^Last goal scored by Ogün Temizkanoğlu with Trabzonspor jersey.
^Last goal scored by Ünal Karaman with Trabzonspor jersey.
^Last goal scored by Abdullah Ercan with Trabzonspor jersey.
^This game was played in İzmir due to Trabzonspor's two game site closure because of the adverse events happened during the game against Galatasaray played on 25 April 1999.
^This game was played in Ankara due to Trabzonspor's two game site closure because of the adverse events happened during the game against Galatasaray played on 25 April 1999.
^The only game in Turkish Cup history where a player achieved a hat-trick in both teams.
^5th player in Trabzonspor history who achieved a hat-trick in Turkish Cup