The publishing and editorial teams would like to thank the following for their invaluable service as 2021 reviewers for PSU Research Review: An International Interdisciplinary 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. 

• Ansari, Shariq
• Bastida, Francisco
• Cugurullo, Federico
• Diab, Ahmed
• Dragomir, Voicu Dan
• Ebekozien, Andrew
• Eissa, Safaa 
• El-Dakhs, Dina
• El-sayed, Samar
• Esquer, Javier
• Goel, Manisha
• Hossain, Syed
• Ibrahim, Masud 
• Kasztelnik, Karina 
• Madhani, Pankaj
• Masud, Md. Abdul Kaium
• Nurunnabi, Mohammad
• Rostan, Pierre
• Sharma, Swati
• Uddin , Md Aftab
• Zhang, Xiaoqing