2020–21 UEFA Nations League A

The 2020–21 UEFA Nations League A is the top division of the 2020–21 edition of the UEFA Nations League, the second season of the international football competition involving the men's national teams of the 55 member associations of UEFA. League A will culminate with the Nations League Finals in June 2021 to determine the champions of the competition.

Format
Following a format change from the first season, League A was expanded from 12 to 16 teams.The league consists of the top ranked UEFA members from 1–16 in the 2018–19 UEFA Nations League overall ranking, split into four groups of four. Each team will play six matches within their group, using the home-and-away round-robin format on double matchdays in September, October and November 2020. The winners of each group will advance to the 2021 UEFA Nations League Finals, and the fourth-placed team of each group will be relegated to the 2022–23 UEFA Nations League B.

The Nations League Finals will take place in June 2021 and be played in a knockout format, consisting of the semi-finals, third place play-off, and final. The semi-final pairings, along with the administrative home teams for the third place play-off and final, are determined by means of a draw. The host country will be selected among the four qualified teams by the UEFA Executive Committee, with the winners of the final crowned as the champions of the UEFA Nations League.

The four group winners will be drawn into groups of five teams for 2022 FIFA World Cup qualification (in order to accommodate for the Nations League Finals).

Team changes
The following are the team changes of League A from the 2018–19 season:

The following team changes were initially set to occur in League A, but did not after no teams were relegated due to the format change by UEFA:

Seeding
In the 2020–21 access list, UEFA ranked teams based on the 2018–19 Nations League overall ranking, with a slight modification: teams which were originally relegated in the previous season were ranked immediately below teams promoted prior to the format change. The seeding pots for the league phase were confirmed 4 December 2019, and were based on the access list ranking.

The draw for the league phase will take place on 3 March 2020, 18:00 CET, in Amsterdam, Netherlands. Each group will contain one team from each pot.

Groups
Times are CET/CEST, as listed by UEFA (local times, if different, are in parentheses).