| 1999 ATP Buenos Aires | |
|---|---|
| Date | November 15–22, 1999 |
| Edition | 27th |
| Champions | |
| Singles | |
 Franco Squillari | |
| Doubles | |
| Guillermo Cañas / Martín García | |
The 1999 ATP Buenos Aires was an ATP Challenger Series tennis tournament held in Buenos Aires, Argentina. The tournament was held November 15 to 22, 1999.
Franco Squillari defeated Hernán Gumy 5–7, 6–1, 6–4
Guillermo Cañas / Martín García defeated 
Paul Rosner / 
Dušan Vemić 6–4, 6–-4
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