See main article: article and 2018 Lisboa Belém Open.
Ruan Roelofse and Christopher Rungkat were the defending champions but chose not to defend their title.
Marcelo Arévalo and Miguel Ángel Reyes-Varela won the title after defeating Tomasz Bednarek and Hunter Reese 6–3, 3–6, [10–1] in the final.