| Conference | Deadline | Date | Country |
| 1.World Nephrology Congress | 2021-10-04 | 2021-10-04 | Spain |
| 2.World Diabetes & Endocrinology Conference | 2021-10-04 | 2021-10-04 | Spain |
| 3.World Nursing Education Conference | 2021-10-04 | 2021-10-04 | Spain |
| 4.4th International Conference on Marketing Finance, HR and Social Science (MFHS-AUGUST-2021) | 2021-08-14 | 2021-08-24 | Spain |
| 5.2021 – 13th International Conference on Research in Life-Sciences & Healthcare (ICRLSH), 27-28 August, Barcelona | 2021-07-27 | 2021-08-27 | Spain |
| 6.4th ICSTR Barcelona – International Conference on Science & Technology Research, 26-27 August 2021 | 2021-07-26 | 2021-08-26 | Spain |
| 7.2021 – XIIIth International Conference on Business, Economics, Law, Language & Psychology (ICBELLP), 25-26 August, Barcelona | 2021-07-25 | 2021-08-25 | Spain |
| 8.4th Barcelona – International Conference on Social Science & Humanities (ICSSH), 24-25 August 2021 | 2021-07-24 | 2021-08-24 | Spain |
| 9.14th ICTEL 2021 – International Conference on Teaching, Education & Learning, 23-24 August, Barcelona | 2021-07-23 | 2021-08-23 | Spain |
| 10.4th International Conference on Current Issues of Social Sciences and Business (CISB-JULY-2021) | 2021-07-14 | 2021-07-24 | Spain |
| 11.2021 – International Conference on Research in Life-Sciences & Healthcare (ICRLSH), 28-29 May, Barcelona | 2021-05-26 | 2021-05-28 | Spain |
| 12.10th International Conference on Computer Technologies and Development (ICCTD 2021) | 2021-05-25 | 2021-10-15 | Spain |
| 13.4th International Conference on Information, Networks and Communications (ICINC 2021) | 2021-05-25 | 2021-10-15 | Spain |
| 14.ICSTR Barcelona – International Conference on Science & Technology Research, 27-28 May 2021 | 2021-05-25 | 2021-05-27 | Spain |
| 15.2021 – International Conference on Business, Economics, Law, Language & Psychology (ICBELLP), 26-27 May, Barcelona | 2021-05-24 | 2021-05-26 | Spain |
| 16.Barcelona – International Conference on Social Science & Humanities (ICSSH), 25-26 May 2021 | 2021-05-23 | 2021-05-25 | Spain |
| 17.ICTEL 2021 – International Conference on Teaching, Education & Learning, 24-25 May, Barcelona | 2021-05-22 | 2021-05-24 | Spain |
| 18.5th International Conference on Building Materials and Materials Engineering (ICBMM 2021) | 2021-05-10 | 2021-09-24 | Spain |
| 19.5th International Conference on Structural and Civil Engineering (ICSCE 2021) | 2021-05-10 | 2021-09-24 | Spain |
| 20.8th International Conference on Advances in Management Sciences (ICAMS 2021) | 2021-04-30 | 2021-06-09 | Spain |
| 21.10th International Conference on Education and Management Innovation (ICEMI 2021) | 2021-04-30 | 2021-06-09 | Spain |
| 22.2nd International Conference on Internet and e-Business (ICIEB 2021) | 2021-04-30 | 2021-06-09 | Spain |
| 23.International Virtual Conference on Spirituality, Religion, Irreligion, and Society today | 2021-04-25 | 2021-05-21 | Spain |
| 24.4th International Conference on Business Management, CSR and Research Method (BMCR-APRIL-2021) | 2021-04-14 | 2021-04-24 | Spain |
| 25.WEASC 4th International Conference on Engineering Technology, Applied Sciences & Information Technology | 2021-04-14 | 2021-04-24 | Spain |
| 26.10th International Conference on Engineering Mathematics and Physics (ICEMP 2021) | 2021-04-10 | 2021-07-01 | Spain |
| 27.3rd International Conference on Image and Video Processing (ICIVP 2021) | 2021-04-10 | 2021-07-01 | Spain |
| 28.EDULEARN21 (13th annual International Conference on Education and New Learning Technologies) | 2021-03-18 | 2021-07-05 | Spain |
| 29.BARCELONA 34th International Conference on “Economics, Humanities and Social Sciences” | 2021-03-15 | 2021-06-28 | Spain |
| 30.BARCELONA 30th International Conference on “Chemical, Biological, Environmental and Natural Sciences” | 2021-03-10 | 2021-06-28 | Spain |
| 31.7th International Conference on Food and Agricultural Engineering (ICFAE 2021) | 2021-03-10 | 2021-04-20 | Spain |
| 32.10th International Conference on Nutrition and Food Sciences (ICNFS 2021) | 2021-03-10 | 2021-04-20 | Spain |
| 33.6th International Conference on Advances on Clean Energy Research (ICACER 2021) | 2021-03-05 | 2021-04-15 | Spain |
| 34.5th International Conference on Energy Economics and Energy Policy (ICEEEP 2021) | 2021-03-05 | 2021-04-15 | Spain |
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