The 2002–03 UEFA Champions League second group stage matches took place between 26 November 2002 and 19 March 2003. The second group stage featured the eight group winners and eight group runners-up from the group stage. Each team was drawn into one of four groups, each of which featured three other clubs. All four teams in the group played home and away matches against each other to determine the winner and runner-up in the group.

At the completion of the second group stage, the top two teams in each group advanced to the quarter-finals, while the other two teams were eliminated from European competition.

The winners of the first group stage groups are put into seeded pots 1 and 2 according to their UEFA coefficients. The four group-winners with the best coefficients will go into seed pot 1. The eight group runners-up will be put into seed pots 3 and 4 according to the same principle, i.e. the four clubs with the best coefficients will go into seed pot 3. One club from each seed pot will be drawn into each of the four groups. Clubs from the same association cannot be drawn into the same group and group-winners and runners-up from the same first-stage group will not be drawn into the same group again.

Key to colours in group tables
Group winners and runners-up advance to the knockout stage

Pot 1 Team Coeff. Real Madrid 147.223 Manchester United 125.729 Barcelona 115.233 Valencia 106.233

Pot 2 Team Coeff. Juventus 91.334 Arsenal 90.729 Internazionale 88.334 Milan 69.334

Pot 3 Team Coeff. Deportivo La Coruña 82.233 Bayer Leverkusen 81.495 Roma 77.334 Borussia Dortmund 73.495

Pot 4 Team Coeff. Lokomotiv Moscow 57.645 Ajax 48.082 Newcastle United 43.729 Basel 14.312

Based on Article 7.06 in the UEFA regulations, if two or more teams are equal on points on completion of the group matches, the following criteria will be applied to determine the rankings:^[1]

1. higher number of points obtained in the group matches played among the teams in question;
2. superior goal difference from the group matches played among the teams in question;
3. higher number of goals scored away from home in the group matches played among the teams in question;
4. superior goal difference from all group matches played;
5. higher number of goals scored;
6. higher number of coefficient points accumulated by the club in question, as well as its association, over the previous five seasons.

Times are CET (UTC+1) as listed by UEFA (local times are in parentheses).

Pos	Team	Pld	W	D	L	GF	GA	GD	Pts	Qualification		BAR	INT	NEW	LEV
1	Barcelona	6	5	1	0	12	2	+10	16	Advance to knockout stage		—	3–0	3–1	2–0
2	Internazionale	6	3	2	1	11	8	+3	11			0–0	—	2–2	3–2
3	Newcastle United	6	2	1	3	10	13	−3	7			0–2	1–4	—	3–1
4	Bayer Leverkusen	6	0	0	6	5	15	−10	0			1–2	0–2	1–3	—

---

---

---

---

---

Pos	Team	Pld	W	D	L	GF	GA	GD	Pts	Qualification		VAL	AJX	ARS	ROM
1	Valencia	6	2	3	1	5	6	−1	9	Advance to knockout stage		—	1–1	2–1	0–3
2	Ajax	6	1	5	0	6	5	+1	8			1–1	—	0–0	2–1
3	Arsenal	6	1	4	1	6	5	+1	7			0–0	1–1	—	1–1
4	Roma	6	1	2	3	7	8	−1	5			0–1	1–1	1–3	—

---

---

---

---

---

Pos	Team	Pld	W	D	L	GF	GA	GD	Pts	Qualification		MIL	RMA	DOR	LMO
1	Milan	6	4	0	2	5	4	+1	12	Advance to knockout stage		—	1–0	0–1	1–0
2	Real Madrid	6	3	2	1	9	6	+3	11			3–1	—	2–1	2–2
3	Borussia Dortmund	6	3	1	2	8	5	+3	10			0–1	1–1	—	3–0
4	Lokomotiv Moscow	6	0	1	5	3	10	−7	1			0–1	0–1	1–2	—

---

---

---

---

---

Pos	Team	Pld	W	D	L	GF	GA	GD	Pts	Qualification		MUN	JUV	BSL	DEP
1	Manchester United	6	4	1	1	11	5	+6	13	Advance to knockout stage		—	2–1	1–1	2–0
2	Juventus	6	2	1	3	11	11	0	7			0–3	—	4–0	3–2
3	Basel	6	2	1	3	5	10	−5	7			1–3	2–1	—	1–0
4	Deportivo La Coruña	6	2	1	3	7	8	−1	7			2–0	2–2	1–0	—

---

---

---

---

---