The 2003–04 UEFA Cup second round was played from 29 October to 11 December 2003.
[1] All match times are CET (UTC+1), as listed by UEFA.
The draw was held on 17 October 2003, 12:00 CEST, at the UEFA headquarters in Nyon, Switzerland.
Teams were divided into geographical groups, each with seeded and unseeded pots.
2–2 on aggregate; Levski Sofia won on away goals.
1–1 on aggregate; Groclin Grodzisk Wielkopolski won on away goals.