The UEFA Cup is a football competition for European club teams, organized by the Union of European Football Associations (UEFA). It began in 1971 and replaced the Inter-Cities Fairs Cup, and it also replaced the UEFA Cup Winners' Cup in 1999. It is the second most important European competition for club teams, after the UEFA Champions League. Football clubs qualify for the UEFA Cup based on their performance in national leagues and national cup competitions.

Qualification for the competition is based on UEFA coefficients, with more places being offered to the more successful nations. Usually places are awarded to teams who finish in various runners-up places in the top-flight leagues of Europe, and the winners of the main cup competitions. A few countries have secondary cup competitions, but the only countries which grant a UEFA Cup place to their secondary cup winners are England and France.

First of all, if the previous UEFA Cup title-holders are not eligible to take part in either of the current UEFA club competitions (UEFA Champions League or UEFA Cup), the UEFA Administration may, at the request of the association of the club concerned, admit this club to the current UEFA Cup competition. Its participation will not be at the expense of the contingent of its association.

Qualification can be quite complicated if one team qualifies for European competition through two different routes. In all cases, if a club is eligible to enter the UEFA Champions League, then the Champions League place takes preference and the club do not enter the UEFA Cup, and the UEFA Cup place is then granted to another club. If a team qualifies for European competition through both winning a cup and league placing, the "spare" UEFA Cup place will go to either the cup runners-up or the highest placed league team which has not already qualified for European competition, depending on the rules of the national association.

Qualification for the UEFA Cup can also be attained in two other ways:

The eleven winners in the third round of the UEFA Intertoto Cup enter the UEFA Cup at the second qualifying round stage from the 2006-07 season.
Three more berths are given to federations that finish above a certain level in UEFA's Fair Play table. The top-placed federation automatically receives a Fair Play entry, and two other federations gain berths via a draw among all other federations that meet qualifying criteria. In all cases, the recipient of a country's Fair Play entry is the highest-placed team in the Fair Play table of that country's top league that has not already qualified for Europe.
More recently, clubs that are knocked out of the qualifying round and the group stage of the Champions League can also join the UEFA Cup, at different stages.