The 2019–20 CONCACAF Nations League A is the top division of the 2019–20 edition of the CONCACAF Nations League, the inaugural season of the international football competition involving the men's national teams of the 41 member associations of CONCACAF. League A will culminate with the final championship in June 2020 to crown the inaugural champions of the CONCACAF Nations League.
League A consists of 12 teams, with the 6 participants of the 2018 FIFA World Cup qualifying hexagonal joined by the top 6 teams from qualifying. The league will be split into four groups of three teams. The teams will compete in a home-and-away, round-robin format over the course of the group phase, with matches played in the official FIFA match windows in September, October and November 2019. The four group winners will qualify to the Nations League final championship, while the four last-placed teams in each group will be relegated to League B for the next edition of the tournament.
The Nations League Finals will take place in June 2020 (originally scheduled for March 2020), and be played in a knockout format at a centralized location selected by CONCACAF. The four teams play the semi-finals, with the matchups determined by the group stage rankings (1 vs 4 and 2 vs 3), followed by the third place match and the final (Regulations Articles 12.8 and 12.10).
In September 2019, it was announced that the Nations League would also provide qualification for all 16 teams participating in the 2021 CONCACAF Gold Cup (no teams would qualify automatically). The top two teams from each of the four League A groups will qualify for the Gold Cup, while the third-placed teams will enter the second round of the Gold Cup Qualifiers.