| 1998 ATP Buenos Aires | |
|---|---|
| Date | 16–23 November |
| Edition | 26th |
| Location | Buenos Aires, Argentina |
| Champions | |
| Singles | |
 Younes El Aynaoui | |
| Doubles | |
 Guillermo Cañas / Martín García | |
The 1998 ATP Buenos Aires was an ATP Challenger Series tennis tournament held in Buenos Aires, Argentina. The tournament was held from November 16 to November 23.
Younes El Aynaoui defeated 
Alberto Martín 7–6, 6–1
Guillermo Cañas / Martín García defeated Alberto Martín / Salvador Navarro 2–6, 6–3, 7–5
Martín Jaite is a former top-10 professional tennis player from Argentina.
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