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 all the contributions made. It is with their help that the journal has been able to publish such high-quality articles.

• Abdul Kadir, Mohd Rizuan
• Abdullah, Nurdianawati Irwani
• Abdullah, Wan Amalina Wan
• Abidin, Shamharir
• Abinzano, Isabel
• Abu Bakar, Noraizah
• Adegboye, Alex
• Agustia, Dian
• Aishah, Nor
• Akther, Taslima
• Al Frijat, Yaser Saleh
• Al-Mohammedi, Younis Ahmed
• Alam, Md. Kausar
• Albawwat, Ibrahim
• Ali, Farman
• Ali, Imran
• Anetor, Friday Osemenshan
• Ariff, Akmalia
• Ashraf, Badar Nadeem
• Astawa, I Putu
• Azmi, Nurul Azlin
• Balagobei, Saseela
• Bananuka, Juma
• Basu, Protik
• Ben Abdallah, Mariem
• Bennouri, Moez
• Budianto, Budianto
• Cai, Xiaojing
• Chalu, Henry
• Chamboko, Richard
• Chen, Wanyi
• Chikwira, Collin
• Chiu,  Yung‐ho
• Cimini, Riccardo
• Cooper, Elizabeth A.
• D'Orazio, Paola
• Daovisan, Hanvedes
• Desai, Naman
• Duréndez, Antonio
• Dwekat, Aladdin
• Farhangdoust, Shayan
• Farooq, Umar
• Felício, Teresa
• Gao, Tao
• Gupta, Namrata
• Haji Besar, Mohd Hairul Azrin
• Huguet, David
• Hung, Shihwei
• Islam, Md. Shafiqul
• Jalaludin, Dayana
• Jeribi, Ahmed
• KHOIFIN, KIKI
• Krisnadewi, Komang Ayu
• Kubo, Katsuyuki
• Lacina, Michael
• Le, Duc
• Li, Jian
• Liao, Zhongju
• Lingaraja, Kasilingam
• Lious, Ntoung A.T.
• Liu, Feng
• Liu, Zhenjie
• Lubbe, Ilse
• Lukman, Hendro
• Mahama, Habib
• Maji, Santi Gopal
• Mardawi, Zeena Mustafa
• Marquez-Ramos, Laura
• Marriott, Neil
• Mawardi, Wisnu
• Miah, Mohammad Dulal
• Mohamed Sghaier Derbali, Abdelkader
• Mohd Kharuddin, Khairul Ayuni
• Molla, Md. Ibrahim
• Moustafa, Esam E.
• Muhamad, Siti Fariha
• Nasih, Mohammad
• NGUYEN2, Linh Ha
• Odongo, Nickson Herbert
• Oncioiu, Ionica
• Özcan, İsmail Çağrı
• Palaon, Hilman
• Picciaia, Francesca
• Plant, Kato
• Qomariyah, Alfiyatul
• Rahman, Syed M
• Raimo, Nicola
• Rana, Md. Sohel
• Razak, Lutfi Abdul
• Salau, Abdulmalik
• Salehi, Mahdi
• Salloum, Charbel
• Sen, Rahul
• SHAMSHAD, MOHD
• Sharma, Dipasha
• Soetanto, Tessa
• Soewarno, Noorlailie
• Srouji, Anan 
• Sultana, Sayema
• Sutan Maruhun, Enny Nurdin
• Swarnapali, RM Nayana Chandani
• Tabash, Mosab
• Tamanni, Luqyan
• Tang, Ying
• Tauringana, Venancio
• Tjahjadi, Bambang
• Tuyon, Jasman
• Uluyol, Buerhan
• Veluchamy, Ramanujam
• Vengesai, Edson
• Villiers, Charl De
• Wan Ismail, Wan Adibah
• Yee, Lee Mei
• Youssef, Mayada Abd El Aziz
• Zaman, Mahbub
• Zheng, Liyi
• Zhou, Tingting