The 1990 African Cup of Nations was the 17th edition of the Africa Cup of Nations, the football championship of Africa (CAF). It was hosted by Algeria. Just like in 1988, the field of eight teams was split into two groups of four. Algeria won its first championship, beating Nigeria in the final 1–0.
If two or more teams finished level on points after completion of the group matches, the following tie-breakers were used to determine the final ranking:
Greatest total goal difference in the three group matches
Greatest number of goals scored in the three group matches
Most points earned in matches against other teams in the tie
Greatest goal difference in matches against other teams in the tie
Greatest number of goals scored in matches against other teams in the tie