Arminia Bielefeld played the 2002–03 season in the Bundesliga. They finished in 16th place, and were relegated from the Bundesliga for the sixth time in their history.^[1]

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.

No. Pos. Nation Player 1 GK  GER Mathias Hain 2 DF  NOR Torjus Hansén 3 DF  BRA Márcio Borges 4 DF  GER Bastian Reinhardt 5 MF  GER Christoph Dabrowski 6 MF  GER Detlev Dammeier 7 FW  KOR Cha Doo-Ri (on loan from Bayer Leverkusen) 8 DF  POL Maciej Murawski 9 FW  SCG Rade Bogdanovic 10 MF  ALB Fatmir Vata 11 MF  COL Jésus Sinisterra (on loan from Banfield) 12 MF  GER Rüdiger Kauf 13 MF  GER Michael Sternkopf 14 FW  CRO Ilija Aračić

No. Pos. Nation Player 15 DF  POL Daniel Bogusz 16 DF  GER Benjamin Lense 17 MF  BEL Bernd Rauw 18 FW  POL Artur Wichniarek 19 FW  SEN Mamadou Diabang 21 MF  GER Massimilian Porcello 23 GK  GER Dennis Eilhoff 24 FW  CZE Marek Heinz (on loan from Hamburger SV) 25 MF  CRO Saša Janić 27 DF  GER Martin Amedick 28 MF  GER Dirk Flock 29 GK  GER Simon Henzler 30 MF  GER Ansgar Brinkmann 33 MF  BIH Mirnel Sadović

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.

No. Pos. Nation Player — GK  GER Oliver Nestmann — GK  GER Sebastian Völzow — DF  TUR Cetin Cakar — DF  GER Norman Klausch — DF  GER Matthias Langkamp — DF  GER Ivan Rako — DF  GER Carsten Rump — DF  GER David Schicht — DF  GER Nils-Christian Schmidt — DF  GER Sebastian Veith — DF  GER Dominik Werling — MF  GER Sebastian Block — MF  TUR Engin Baytar — MF  GER Henning Grieneisen — MF  GER Finn Holsing — MF  GER Kai Heidenreich

No. Pos. Nation Player — MF  GER Pascal Hofbüker — MF  GER Jonnie Klausch — MF  GER Matthias Klein — MF  GER Daniel Kurth — MF  GER Wojtek Kwasniok — MF  GER Rafael Psyk — MF  TUR Firat Sansar — MF  GER Marco Schlobinski — MF  GER Christian Schnitker — MF  GER Jan-Christopher Smith — FW  SCG Arsenije Klirusic — FW  GER Lars Mettenbrink — FW  GER Stefan Studtrucker — FW  BIH Amir Spahić — FW  GER Salih Yavuz

Player	From	Fee	Date	Notes
Rade Bogdanović	Werder Bremen	Free	July 2002	[2]
Saša Janić	SSV Reutlingen	Free	July 2002	[2]
Benjamin Lense	Darmstadt 98	€200,000	July 2002	[2]
Maciej Murawski	Legia Warsaw	Free	July 2002	[2]
Bernd Rauw	Alemannia Aachen	€180,000	July 2002	[2]
Jésus Sinisterra	Banfield	Loan	July 2002	[2]
Mirnel Sadović	Austria Vienna	Free	July 2002	[2]
Torjus Hansén	Lillestrøm	€150,000	August 2002	[3]
Cha Doo-Ri	Bayer Leverkusen	Loan	August 2002
Marek Heinz	Hamburger SV	Loan	January 2003
Simon Henzler	FC St. Pauli		January 2003

Player	To	Fee	Date	Notes
Lawrence Adjei	Eintracht Trier	Free	July 2002	[2]
Jörg Bode	FC Augsburg	Free	July 2002	[2]
Arne Friedrich	Hertha BSC	€1,800,000	July 2002	[2]
André Hofschneider	FC Augsburg	Free	July 2002	[2]
Alexander Klitzpera	Alemannia Aachen	Free	July 2002	[2]
Zdenko Miletić	FC Augsburg	Free	July 2002	[2]
Bartosz Partyka	Pogoń Szczecin	Free	July 2002	[2]
Tobias Schäper	BV Cloppenburg	Free	July 2002	[2]
Christian Wück	Retired		July 2002	[2]
Dirk van der Ven	Yokohama FC	Free	January 2003
Erhan Albayrak	Fenerbahçe S.K.	Undisclosed	January 2003
Heinz Müller	FC St. Pauli		January 2003