The publishing and editorial teams would like to thank the following, for their invaluable service as 2021 reviewers for this journal. We are very grateful for the contributions made. With their help, the journal has been able to publish such high-quality articles:
| Abbas, Mazhar |
| Abreu, Mônica |
| Abubakar, A. Mohammed |
| Adeyemi, Ismail |
| Agrawal, Amit |
| Akers, Katherine |
| Aldhaen, Esra |
| Ali, Jawad |
| Andrade, Lelis |
| Antunes, Luiz Guilherme |
| Ashiq, Murtaza |
| Avelar, Ewerton |
| Baker, David |
| Barakat, Simone R. |
| Baro, Ebikabowei |
| Baroni, Rodrigo |
| Bell, Brigitte |
| Bernardes, Roberto |
| Bird, Nora |
| Birn, Robin |
| Butt, Saba |
| Campos, Sergio |
| Cançado, Vera L. |
| Carvalho Vieira, Kelly |
| Carvalho, Leonor |
| Chaudhuri, Ranjan |
| Cheah, Jun-Hwa |
| Contreras Pinochet, Luis |
| Crumpton, Michael |
| Dantas de Figueiredo, Marina |
| De Sousa Neto, Jose |
| De Souza, Antônio Artur |
| Dias , Marcelo |
| Dubnjakovic , Ana |
| Durst, Susanne |
| Eugénio, Teresa |
| Ferenhof, Helio |
| Fialho Silva, Ana |
| Fragoso, Rui |
| Galalae, Cristina |
| Hasan, Najmul |
| Hernández-Linares, Remedios |
| Ho, Bruce Chien-Ta |
| Jabbar, Abdul |
| Jeunon, Ester |
| Khan, Asad |
| Khayer, Abul |
| Lazaro, Jose Carlos |
| Lima, Reginaldo |
| Loan, Fayaz |
| Lucas, Maria Raquel |
| Machtynger, Jon |
| Mafra Pereira, Frederico Cesar |
| Malik, Amara |
| Marchiano, Marcello |
| Marreiros, Cristina Galamba |
| Medeiros, Mauricius |
| MeiPeng, Low |
| Mohamad, Bahtiar |
| Molinillo, Sebastian |
| Moreira, Rafael |
| Moudud-Ul-Huq, Syed |
| Mutum, Dilip |
| Nemati-Anaraki, Leila |
| Ngah, Rohana |
| Novas, Jorge |
| Oentoro, Wanny |
| Pandita, Ramesh |
| Pardo, Clara |
| Parnell, Brett |
| Patlán Pérez, Juana |
| Pereira, Michele |
| Pratono, Aluisius |
| Quaresma, Rui |
| Quoquab, Farzana |
| Rafi, Muhammad |
| Raza, Hassan |
| Razaghi, Shokouh |
| Raziq, Muhammad Mustafa |
| Richardson, Joanna |
| Riley-Huff, Debra |
| Romero, Nuria |
| Rossetto, Dennys Eduardo |
| Royo, Sonia |
| Salamzadeh, Aidin |
| Salamzadeh, Yashar |
| Saleem, Sharjeel |
| Santos, Edicreia Andrade dos |
| Serra, Fernando |
| Shabbir, Rizwan |
| Shakoor, Ayesha |
| Shokouhyar, Sajjad |
| Silva, Joao Paulo Nascimento |
| Stocker, Fabricio |
| Talukder, Md. Shamim |
| Tan, Li Pin |
| Tommaso, Silvia |
| Vidal Barbosa, Francisco |
| Will, Markus |
| Xu, Mark |
| Zieba, Malgorzata |