Team Melli defeated Bulgaria and Angola in two friendly matches in September.
Wins against Germany and Turkey in the recent international break consolidated Japan's position as Asia's highest-ranked national team.
Argentina, who dethroned Brazil at the summit in April, remained top after beating Ecuador and Bolivia in their 2026 World Cup qualifiers earlier this month.
Second-placed France, who lost to Germany in a friendly last week, retained second place followed by Brazil (third), England (fourth) and Belgium (fifth).
The next FIFA World Ranking will be published on 26 Oct.
MNA/TT