2002–03 UEFA Cup first round
The first round of the 2002–03 UEFA Cup was contested between 17 September and 3 October 2002. A total of 96 teams participated in this round, with the 48 winners advancing to the second round.
Format
In the first round, each tie was played over two legs, with each team playing one leg at home. The team that scored more goals on aggregate over the two legs advanced to the next round. If the aggregate score was level, the away goals rule was applied, i.e., the team that scored more goals away from home over the two legs advanced. If away goals were also equal, then thirty minutes of extra time were played, divided into two fifteen-minute halves. The away goals rule was again applied after extra time, i.e., if there were goals scored during extra time and the aggregate score was still level, the visiting team advanced by virtue of more away goals scored. If no goals were scored during extra time, the tie was decided by penalty shoot-out.Qualified teams
The first round involved 96 teams: 39 directly qualified for this round, 41 advancing from the qualifying round, and 16 losers from the Champions League third qualifying round.| Teams directly qualified for this round |
| Teams advancing from the qualifying round |
| Third-placed teams from the Champions League third qualifying round |
| Team | Team | Team | Team | ||||
 Lazio | 106.334 |  Dinamo Zagreb | 35.520 |  Red Star Belgrade | 18.165 |  Austria Wien | 11.625 |
| Parma | 91.334 |  Málaga | 34.233 |  Xanthi | 18.058 |  Levski Sofia | 11.582 |
 Chelsea | 83.729 |  Sporting CP | 34.124 |  Legia Warsaw | 17.750 |  Rapid București | 10.958 |
| Leeds United | 76.729 |  Vitesse Arnhem | 30.082 |  Viking | 17.737 |  Ferencváros | 9.874 |
| Celta Vigo | 76.233 | Chievo | 29.334 |  Ankaragücü | 16.362 |  Primorje | 8.916 |
| Porto | 66.124 |  Grasshoppers | 29.312 | Amica Wronki | 15.750 |  Matador Púchov | 8.832 |
 Bordeaux | 63.176 |  Slovan Liberec | 29.312 |  Maccabi Tel Aviv | 15.666 | Polonia Warsaw | 8.750 |
| Panathinaikos | 57.058 | Blackburn Rovers | 28.729 |  CSKA Moscow | 14.645 |  Midtjylland | 8.687 |
| Deportivo Alavés | 55.233 | Fulham | 27.729 | Zenit Saint Petersburg | 14.645 | Odense | 8.687 |
 Stuttgart | 53.495 | Heerenveen | 27.082 | Litex Lovech | 14.582 |  Djurgården | 8.620 |
| Hertha BSC | 52.495 | Hapoel Tel Aviv | 26.666 | CSKA Sofia | 14.582 | Sartid | 8.165 |
| Paris Saint-Germain | 51.176 | Beşiktaş | 26.362 | Denizlispor | 14.362 | Újpest | 7.874 |
| Real Betis | 49.233 | GAK | 25.625 | Viktoria Žižkov | 14.312 |  Anorthosis Famagusta | 7.666 |
| Sparta Prague | 48.312 | Copenhagen | 24.687 | Partizan | 14.165 | Național București | 6.958 |
| Slavia Prague | 47.312 | Servette | 24.312 | Leixões | 14.124 | ZTE | 6.874 |
| Schalke 04 | 46.495 |  Shakhtar Donetsk | 23.979 | Hajduk Split | 13.520 |  Dinamo Tbilisi | 6.499 |
| Werder Bremen | 46.495 | Iraklis | 23.058 |  Aberdeen | 13.062 | APOEL | 4.666 |
| Rangers | 46.062 | Varteks Varaždin | 22.520 | Livingston | 13.062 |  Ventspils | 3.582 |
| PAOK | 41.058 | Wisła Kraków | 21.750 | Metalurh Donetsk | 12.979 |  Zimbru Chișinău | 3.582 |
 Anderlecht | 38.762 | Lorient | 21.176 | Metalurh Zaporizhya | 12.979 |  Gomel | 2.041 |
| Sturm Graz | 37.625 | Utrecht | 21.082 | Mouscron | 12.762 |  Sūduva Marijampolė | 1.915 |
| Boavista | 36.124 | Brøndby | 20.687 | Stabæk | 12.737 |  Željezničar | 0.666 |
| Celtic | 36.062 | Fenerbahçe | 19.362 | Kärnten | 12.625 | Sarajevo | 0.666 |
| Ipswich Town | 35.729 | Kocaelispor | 19.362 | AIK | 12.620 | Široki Brijeg | 0.666 |
Seeding
The draw was held on 30 August 2002 in Monaco. Before the draw, the 96 teams were divided into 48 seeded and 48 unseeded teams, based on their 2002 UEFA club coefficients. For convenience of the draw and to avoid pairing of teams from the same association, the teams were distributed into six groups of sixteen teams, each containing an equal number of seeded and unseeded teams.In the draw, a seeded team from each group was paired with an unseeded team from the same group. The first team to be drawn played the first leg at home.
Matches
The first leg matches were played on 17 and 19 September, and the second leg matches were played on 1 and 3 October 2002.First leg
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Second leg
Austria Wien won 5–2 on aggregate.----
Ipswich Town won 2–1 on aggregate.
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Porto won 6–2 on aggregate.
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PAOK won 5–3 on aggregate.
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Dinamo Zagreb won 9–1 on aggregate.
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Leeds United won 2–1 on aggregate.
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Beşiktaş won 7–2 on aggregate.
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Wisła Kraków won 8–1 on aggregate.
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Celtic won 10–1 on aggregate.
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Werder Bremen won 10–2 on aggregate.
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Lazio won 4–0 on aggregate.
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Partizan won 6–4 on aggregate.
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Red Star Belgrade won 2–0 on aggregate.
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Fulham won 3–2 on aggregate.
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3–3 on aggregate. Viktoria Žižkov won on away goals.
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Parma won 4–3 on aggregate.
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Viking won 5–4 on aggregate.
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Real Betis won 4–1 on aggregate.
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Málaga won 1–0 on aggregate.
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Boavista won 4–2 on aggregate.
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Vitesse won 2–1 on aggregate.
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Levski Sofia won 5–2 on aggregate.
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FC National București won 3–2 on aggregate.
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4–4 on aggregate. Blackburn Rovers won on away goals.