2018 Challenger de Buenos Aires – Doubles

Ariel Behar and Fabiano de Paula were the defending champions but chose not to defend their title.

Guido Andreozzi and Guillermo Durán won the title after defeating Marcelo Demoliner and Andrés Molteni 6–4, 4–6, [10–3] in the final.

Seeds
• # 🇧🇷 Marcelo Demoliner / 🇦🇷 Andrés Molteni (final)

• # 🇦🇷 Guido Andreozzi / 🇦🇷 Guillermo Durán (champions)

• # 🇦🇷 Tomás Lipovšek Puches / 🇧🇷 Fernando Romboli (semifinals)

• # 🇵🇪 Sergio Galdós / 🇧🇴 Federico Zeballos (semifinals)