The first group stage of the 2001–02 UEFA Champions League was the first stage of the competition proper, following the qualifying phase. 16 winners from the third qualifying round, 10 champions from countries ranked 1–10, and six second-placed teams from countries ranked 1–6 were drawn into eight groups of four teams each. Play began on 11 September 2001 and ended on 31 October 2001, when the top two teams in each group advanced to the second group stage, and the third-placed team in each group dropped down to the Third Round of the 2001–02 UEFA Cup.

Due to the September 11 attacks, matches scheduled to take place on 12 September were postponed until 10 October. Matches scheduled on the day of the attacks went ahead with a minute's silence taking place before kick-off.

Seeding was determined by the UEFA coefficients.^[1] Clubs from the same association were split between groups A–D and E–H, ensuring that they not play on the same day if possible.

More information Pot 1, Team ...

Pot 1
Team	Coeff.
Bayern MunichTH	110.316
Real Madrid	114.605
Manchester United	110.644
Barcelona	108.604
Lazio	105.119
Juventus	98.119
Arsenal	76.644
Liverpool	73.643

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More information Pot 2, Team ...

Pot 2
Team	Coeff.
Borussia Dortmund	73.315
Galatasaray	71.987
Porto	68.136
Roma	68.119
Lyon	64.176
Deportivo La Coruña	63.605
Spartak Moscow	61.854
Mallorca	60.604

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More information Pot 3, Team ...

Pot 3
Team	Coeff.
Schalke 04	57.316
Bayer Leverkusen	56.315
Dynamo Kyiv	55.915
Lokomotiv Moscow	53.853
Rosenborg	53.799
Feyenoord	53.124
PSV Eindhoven	51.124
Olympiacos	47.183

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More information Pot 4, Team ...

Pot 4
Team	Coeff.
Nantes	45.176
Anderlecht	43.075
Sparta Prague	37.395
Panathinaikos	37.183
Boavista	28.137
Celtic	25.310
Fenerbahçe	24.987
Lille	21.175

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