A tournament is a competition involving a relatively large number of competitors, all participating in a sport or game. More specifically, the term may be used in either of two overlapping senses:

These two senses are distinct. All golf tournaments meet the first definition, but while match play tournaments meet the second, stroke play tournaments do not, since there are no distinct matches within the tournament. In contrast, football (soccer) leagues like the Premier League are tournaments in the second sense, but not the first, having matches spread across many stadia over a period of up to a year. Many tournaments meet both definitions; for example, the Wimbledon tennis championship.

The 2015–16 UEFA Europa League group stage was played from 17 September to 10 December 2015. A total of 48 teams competed in the group stage to decide 24 of the 32 places in the knockout phase of the 2015–16 UEFA Europa League.

Draw

The draw was held on 28 August 2015, 13:00 CEST, at the Grimaldi Forum in Monaco. The 48 teams were drawn into twelve groups of four, with the restriction that teams from the same association could not be drawn against each other. For the draw, the teams were seeded into four pots based on their 2015 UEFA club coefficients. Moreover, the draw was controlled for teams from the same association in order to split the teams evenly into the two sets of groups (A–F, G–L) for maximum television coverage.

The fixtures were decided after the draw. On each matchday, six groups play their matches at 19:00 CEST/CET, while the other six groups play their matches at 21:05 CEST/CET, with the two sets of groups (A–F, G–L) alternating between each matchday. There are other restrictions: for example, teams from the same city (e.g., Sporting CP and Belenenses, Fenerbahçe and Beşiktaş) in general do not play at home on the same matchday (UEFA tries to avoid teams from the same city playing at home on the same day, due to logistics and crowd control), and teams in certain countries (e.g., Belarus, Russia) do not play at home on the last matchday (due to cold weather and simultaneous kick-off times).