2021 Maia Challenger II

The 2021 Maia Challenger II was a professional tennis tournament played on clay courts. It was the fourth edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Maia, Portugal from 13 to 19 December 2021.

Seeds

 * 1 Rankings are as of 6 December 2021.

Other entrants
The following players received wildcards into the singles main draw:
 * Pedro Araújo
 * Tiago Cação
 * Fábio Coelho

The following player received entry into the singles main draw as a special exempt:
 * 🇺🇦 Oleg Prihodko

The following players received entry into the singles main draw as alternates:
 * 🇲🇦 Elliot Benchetrit
 * 🇺🇦 Oleksii Krutykh
 * 🇪🇸 Oriol Roca Batalla

The following players received entry from the qualifying draw:
 * 🇩🇪 Elmar Ejupovic
 * 🇮🇹 Edoardo Lavagno
 * 🇮🇹 Luca Potenza
 * Damien Wenger

Singles

 * Tseng Chun-hsin def. Nuno Borges 5–7, 7–5, 6–2.

Doubles

 * Nuno Borges / Francisco Cabral def. 🇵🇱 Piotr Matuszewski / 🇦🇹 David Pichler 6–4, 7–5.