The qualifying rounds for the 2002–03 UEFA Champions League began on 17 July 2002. In total, there were three qualifying rounds which provided 16 clubs to join the group stage.
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| Qualify for the group stage | |
| Eliminated in the Third qualifying round; Advanced to the UEFA Cup first round |
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The draw for this round was performed on 21 June 2002 in Geneva, Switzerland.
Teams with a coefficient of at least 1.498 were seeded.[1]
Vardar won 4–1 on aggregate.----Hibernians won 3–2 on aggregate.----Belshina won 3–2 on aggregate.----Željezničar won 4–0 on aggregate.----Skonto won 6–0 on aggregate.----APOEL won 1–0 on aggregate.----4–4 on aggregate; Sheriff won on away goals.----Pyunik won 6–0 on aggregate.----Dinamo Tirana won 3–2 on aggregate.----Torpedo Kutaisi won 6–2 on aggregate.
The draw for this round was performed on 21 June 2002 in Geneva, Switzerland.
Teams with a coefficient of at least 10.916 were seeded.[1]
Grazer AK won 6–1 on aggregate.----Maccabi Haifa won 5–0 on aggregate.----Dynamo Kyiv won 6–2 on aggregate.----2–2 on aggregate; Zalaegerszeg won on away goals.----Boavista won 7–3 on aggregate.----Sparta Prague won 5–1 on aggregate.----Levski Sofia won 2–0 on aggregate.----Legia Warsaw won 4–2 on aggregate.----Partizan won 5–1 on aggregate.----Basel won 4–1 on aggregate.----APOEL won 5–4 on aggregate.----Željezničar won 2–0 on aggregate.----Club Brugge won 4–1 on aggregate.----Brøndby won 5–0 on aggregate.
The draw for this round was performed on 26 July 2002 in Nyon, Switzerland.
Teams with a coefficient of at least 36.062 were seeded.[1]
4–4 on aggregate; Genk won on away goals.----Feyenoord won 3–0 on aggregate.----Maccabi Haifa won 5–3 on aggregate.----Auxerre won 1–0 on aggregate.----AEK Athens won 4–2 on aggregate.----Manchester United won 5–1 on aggregate.----Internazionale won 2–0 on aggregate.----Bayern Munich won 6–1 on aggregate.----2–2 on aggregate; Club Brugge won on penalties.----Newcastle United won 5–0 on aggregate.----3–3 on aggregate; Basel won on away goals.----Lokomotiv Moscow won 5–3 on aggregate.----Rosenborg won 4–2 on aggregate.----Dynamo Kyiv won 2–0 on aggregate.----2–2 on aggregate; Milan won on away goals.----Barcelona won 4–0 on aggregate.