See main article: 2020 Lisboa Belém Open.
Philipp Oswald and Filip Polášek were the defending champions[1] but chose not to defend their title.
Roberto Cid Subervi and Gonçalo Oliveira won the title after defeating Harri Heliövaara and Zdeněk Kolář 7–6(7–5), 4–6, [10–4] in the final.