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:

• Acioli, Carina
• Agrawal, Saurabh
• Ahmed, Syed Hassan
• Akther, Shahin
• Al-Rakhami, Mabrook
• Al-Yafi, Karim
• Albizri, Abdullah
• Albizri, Abdullah
• Alhammad, Muna
• Ali, Syed Mithun
• Alraja, Mansour
• Amjad, Abdul Moeed
• Arami, Mitra
• Asdecker, Björn
• Azadi, Majid
• Babaee Tirkolaee, Erfan
• Bag, Surajit
• Bal, Alperen
• Balezentis, Tomas
• Baloutsos, Stratos
• Bamel, Nisha
• Barata, João
• Bashiri, Mahdi
• Bou Hamad, Imad
• Breitbarth, Tim
• Bytheway, Andy
• Cerqueira Lima, Marcos
• Chedrawi, Charbel
• Cheikhrouhou, Naoufel
• Chen, Baiyu
• Chen, Chi-Hua
• Chen, Xihui
• Cheng, S. L.
• Cheuk , Hang Au 
• Contreras Pinochet, Luis
• Cordon, Carlos
• Daowd, Ahmad
• Daowd, Ahmad
• Daoyin, Sun
• Daultani, Yash
• De Marco, Marco
• Del Aguila-Obra, Ana Rosa
• Demir, Ezgi
• Dennehy, Denis
• Dhillon, Manpreet Kaur
• Dubey, Rameshwar
• El-Masri, Mazen
• Elbanna, Amany
• Eldabi, Tillal
• Enang, Iniobong
• Erkan, İsmail
• Fantazy, Kamel
• Farzipoor Saen, Reza
• Fathi, Mohammad Reza
• Ferreira Da Silva, Catarina
• Fisher, Ron
• Fry, John
• Fu, Hanliang
• Gadekallu, Thippa Reddy
• Gagnon, Stéphane
• Galal-Edeen, Galal
• Gao, Honghao
• Gao, Shang
• Gedam, Vidyadhar V.
• Gharib, Rebwar Kamal
• González-Ramírez, Reyes
• Grover, Purva
• Güner Gören, Hacer
• Gupta, M. P.
• Gupta, Narain
• Haldorai, Anandakumar
• Hasan, Ruaa
• He, Wu
• Hickey, Patrick
• Hong, Paul
• Hussain, Zahid
• Irani, Seda
• Jafarzadeh Ghoushchi, Saeid
• Jain, Geetika
• Jan, Mian
• Janssen, Marijn
• Jasimuddin, Sajjad
• Jayawardena, Nirma Sadamali
• Jebarajakirthy, Charles
• Jia, Wei
• Jolfaei, Alireza
• Joshi, Kedar
• Jung, Euisung
• Kadry, Seifedine
• Kahraman, Cengiz
• Kamble, Sachin
• Kandasamy, Jayakrishna
• Kazancoglu, Yigit
• Khan, Syed Abdul Rehman
• Khoumbati, Khalil.
• Kiani Mavi, Reza
• Kozlovski, Eugene
• Kuciapski, Michał
• Kucukaltan, Berk
• Kumar Mangla, Sachin
• Kumar, Ajay
• Kumar, Rahul
• Kumar, Satish
• Laguir, Issam
• Lang, Le Dang
• Lathabhavan, Remya
• Le, Taowen
• Lech, Przemysław
• Lee, Carmen
• Li, Gendao
• Liu, Yang
• Lopes De Sousa Jabbour, Ana Beatriz
• Loukis, Euripides
• Love, Peter
• Luthra, Sunil
• Lv, Zhihan
• Ma, Liang
• Mahroof, Kamran
• Malik, Nishtha
• Mangla, Sachin
• Manoel Queiroz, Maciel
• Maqbool, Ayesha
• Mardani, Abbas
• Marić, Josip
• Marinkovic, Dragan
• Maruyama, Takao
• Melin, Ulf
• Modgil, Sachin
• Mordi, Chima
• Muhammad, Sardar
• Mumtaz, Rao Shahid
• Muneeb, Dilnaz
• Munim, Ziaul Haque
• Mustafee, Navonil
• Nadeem, Simon Peter
• Nannat, Sainul Abideen
• Pamucar, Dragan
• Panchal, Gajanan
• Pappas, Ilias
• Parthasarathy, Ray
• Ponce, Pablo
• Rafi-Ul-Shan, Piyya Muhammad
• Rafi-Ul-Shan, Piyya Muhammad
• Rahardja, Untung
• Rajagopal, Rajesh
• Ramachandran, Muthu
• Rana, Nripendra
• Rashidi, Kamran
• Raut, Rakesh
• Razzaque, Anjum
• Rupino Da Cunha, Paulo
• Sagnak, Muhittin
• Saide, Saide
• Sarma, Prs
• Schavion, Francesco
• Seles, Bruno Michel Roman Pais
• Shah, Adeel
• Shah, Mahmood
• Sharma, Pradip Kumar
• Shayganmehr, Masoud
• Shukla, Nagesh
• Shukla, Shekhar
• Singh, Harjit
• Sivarajah, Uthayasankar
• Soares Monteiro, Emiliano
• Soja, Piotr
• Song, Malin
• Souri, Alireza
• Srivastava, Gautam
• Srivastava, Gautam
• Srivastava, Shashikant
• Stekelorum, Rebecca
• Stević, Željko
• Sun, Cheng
• Sun, Yuan
• Tandja Mbianda, Djerry Charli
• Tarhini, Abbas
• Tehseen, Shehnaz
• Themistocleous, Marinos
• Theodoridis, Prokopis
• Tian, Hengqi
• Trialih, Rahmat
• Tse, Mike
• Tsohou, Aggeliki
• Tu, Yuqi
• Tyagi, Dinesh Kumar
• Uddin, M. Irfan
• Upadhyay, Arvind
• Valverde, Raul
• Veglianti, Eleonora
• Verma, Basant Kumar
• Vrontis, Demetris
• Wang, Heng
• Wang, Wei
• Wei, Mingkun
• Wei, Wei
• Wu, C. H.
• Wu, Kaijun
• Wu, Wei
• Xie, Chunping
• Xing, Yunfei
• Xu, Yong
• Xu, Yue
• Yadav, Raghav
• Yadav, Sachin
• Yadav, Vinod
• Yang, Aimin
• Yang, Changhui
• Yu, Keping
• Zhang, Liangliang
• Zhang, Linling
• Zhao, Xin
• Zhou, Xiaoxiao
• Zhu, Chunsheng