AT-9 may mean:

• Curtiss AT-9, aeroplane.
• AT-9 Spiral-2, missile.
• Vienna, a state of Austria; AT-9 is its ISO 3166-2:AT country subdivision code.

• 1958–59 1re serie season
• 1958–59 1re série season
• 1958–59 Aberdeen F.C. season
• 1958–59 A PFG
• 1958–59 Austrian Hockey League season
• 1958–59 Besiktas J.K. season
• 1958–59 Beşiktaş JK season
• 1958–59 Birmingham City F.C. season
• 1958–59 British National League season
• 1958–59 Bulgarian Hockey League season
• 1958–59 Clemson Tigers men's basketball team
• 1958–59 Colchester United F.C. season
• 1958–59 Copa del Generalisimo
• 1958–59 Copa del Generalísimo
• 1958–59 Copa del Rey
• 1958–59 Czechoslovak Extraliga season
• 1958–59 DDR-Oberliga (ice hockey) season
• 1958–59 Detroit Pistons season
• 1958–59 Duke Blue Devils men's basketball team
• 1958–59 Eintracht Frankfurt season
• 1958–59 European Cup (handball)
• 1958–59 FA Cup qualifying rounds
• 1958–59 FC Dinamo Bucureşti season
• 1958–59 FIBA Women's European Champions Cup
• 1958–59 French Rugby Union Championship