| Dr | Rabiu Saminu | Jibril | Kano state polytechnic | Nigeria | topteachers.net |
| Ms | Raghi | K R | Sathyabama Institute of Science and Technology | India | topteachers.net |
| Ms | Rahaf | Alsuhaimi | King Abdulaziz University | Saudi Arabia | topteachers.net |
| Mr | Raja | Nakka | Ragon Institute of MGH, MIT & Harvard | United States | topteachers.net |
| Prof | Rajasimman | Manivasagan | Annamalai University | India | topteachers.net |
| Dr | Rajesh Kumar | Soothar | Sindh Agriculture Uiversity, Tandojam | Pakistan | topteachers.net |
| Dr | Rakesh Singh | Negi | Department of chemistry PNG Govt PG college Ramnagar | India | topteachers.net |
| Dr | Ramesh | Chinnasamy | Wildlife Institute of India | India | topteachers.net |
| Dr | Rania | H. Al-Taie | Mustansiriyah University, College of Medicine | Iraq | topteachers.net |
| Dr | Rauoof Ahmad | Rather | SKUAST K | India | topteachers.net |
| Mr | Ravindaran | Thangavel | Amrita School of Engineering | India | topteachers.net |
| Mr | Reagan | MANDIYA | Université de Lorraine | France | topteachers.net |
| Ms | Réla | Bodea | George Emil Palade UMPhST Targu Mures | Romania | topteachers.net |
| Prof | reza | alimardani | university of tehran | Iran | topteachers.net |
| Assist. Prof. Dr | Roberta | Lassance-Soares | University of Miami | United States | topteachers.net |
| Mrs | Rosa María | Martínez-Espinosa | University of Alicante (Spain) | Spain | topteachers.net |
| Prof. Dr | Rose-Mary | Boustany | American Univercity of Beirut | Lebanon | topteachers.net |
| Ms | Roya | Mohammadi Mey Abadi | Faculty of Pharmacy and Food Sciences University of Barcelona | Spain | topteachers.net |
| Dr | Roya | Mohammadi Mey Abadi | Department of Pharmacy and Pharmaceutical Technology, and Physical Chemistry, Faculty of Pharmacy and Food Sciences, University of Barcelona | Spain | topteachers.net |
| Prof. Dr | Runjiang | Song | Guizhou University | China | topteachers.net |