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This collaborative meta-analysis was supported by the Swiss National Science Foundation and the Laura and John Arnold Foundation (grant supporting the post-doctoral fellowship at the Meta-Research Innovation Center at Stanford (METRICS), Stanford University). The funders had no role in the design of this collaborative meta-analysis; in the collection, analysis, and interpretation of data; or in the report writing., We would like to express our warm gratitude to all participating patients and convalescent plasma donors. We thank Katja Suter and Sina Ullrich, University of Basel, for their administrative assistance. For their helpful contribution to individual trials, we thank Erica Wood, Iain Gosbell, Richard Charlewood, Thomas Hills, Veronica Hoad, Kristina Kairaitis, Aikaj Jindal, John Gerrard, Hong Foo, Adam Stewart, and Nanette Trask (ASCOT trial); Amalia Bravo-Lindoro, Ral Carrillo-Esper, Karla Maldonado-Silva, Catalina Casillas-Suárez, Orlando Carrillo-Torres, Sandra Murrieta, Elizabeth Diaz-Padilla, Eli Omar Zavaleta, Yadira Bejar-Ramirez, and Evelyn Cortina-de la Rosa (CPC-SARS trial); Sheri Renaud, Roel Rolando-Almario, and Jacqueline Day (NCT04385199 trial); Sandra Tingsgrd, MD, Karen Brorup Heje Pedersen, MD, Michaela Tinggaard, MD, Louise Thorlacius-Ussing, MD, Clara Lundetoft Clausen, MD, Nichlas Hovmand, MD, Simone Bastrup Israelsen, MD, Cecilie Leding, MD, Katrine Iversen, MD, Maria Engel Miller, MD, Hkon Sandholdt, MSc biostatistician (CCAP-2 trial). On behalf of the IRCT20200310046736N1 trial, we thank the Khuzestan Blood Transfusion Organization for specialized assistance in the preparation and maintenance of plasma samples. On behalf of the NCT04332835 trial, we thank all the members of the "PC-COVID-19 Group" at the Clinica del Occidente and Hospital Universitario Mayor Mederi in Bogota, and Clinica CES in Medellin. On behalf of the NCT04403477 trial, we thank Miles Carroll for his support regarding the antibody testing in Bangladesh. The Co-CLARITY team would like to extend their gratitude to the Department of Science and Technology Philippine Council for Health Research and Development and the UP-Philippine General Hospital for all their support in the setting up and conduct of the trial. For helpfully communicating details of their trial, we thank members of the PlasmAr trial, NCT04359810 trial (Max O´Donnell), NCT04468009 trial, and CTRI/2020/05/025299 trial. Support for title page creation and format was provided by AuthorArranger, a tool developed at the National Cancer Institute (https://www.cancer.gov/)., During the conduct of the study, the following is reported: Dr. Berry reports being employee with ownership role at Berry Consultants (receives payments for statistical modeling and design of REMAP-CAP). Dr. Castillo reports grants from DOST PCHRD. Dr. Daly reports grants from Medical Research Future Fund (Australian Govt) and RBWH. Dr. Denkinger reports grants from German Ministry for Education and Research. Dr. Dumagay reports grants from Philippine Council for Health Research and Development. Dr. Dunachie reports grants from UK Department of Health and Social Care, grants from UK National Institute of Health Research. Dr. Gauiran reports grants from Department of Science and Technology—Philippine Council for Health Research and Development. Dr. Gordon reports grants from NIHR, grants from NIHR Research Professorship (RP-2015-06-18), and non-financial support from NIHR Clinical Research Network. Dr. Higgins reports grants from NHMRC and from the Minderoo Foundation. Dr. Hills reports grants from Health Research Council of New Zealand. Dr. Holm reports grants from Swedish Government Funds for Clinical Research (ALF). Dr. Janssen and Dr. Müller-Tidow report grants from the Federal Ministry of Education and Research in Germany (BMBF) to the RECOVER clinical trial. Dr. Krapp reports grants from Department of Foreign Affairs, Trade, and Development of Canada, grants from Fundación Telefónica del Perú. Dr. J. Lim reports grants from the Department of Science and Technology, Philippine Council for Health Research and Development. Dr. Lucero reports grants from Philippine Council for Health Research and Development. Dr Manrique reports economic support from Grupo ISA Intercolombia for the project development of trial NCT04332835. Drs. McQuilten and Wood report grants from Medical Research Future Fund. Dr. McVerry reports grants from The Pittsburgh Foundation, Translational Breast Cancer Research Consortium, and from UPMC Learning While Doing Program. Mr. Mouncey reports grants from National Institute for Health Research and from the European Union FP7: PREPARE. Dr. Najdovski reports payment from KUL Leuven to Belgian Red Cross for supply of convalescent plasma. Dr. Nichol reports grants from Health Research Board of Ireland. Dr. D. Roberts reports grants from the National Institute for Health (UKRIDHSC COVID-19 Rapid Response Rolling Call—Grant Reference Number COV19-RECPLAS) and the European Commission (SUPPORT-E #101015756). Dr. Rowan reports grants from the European Commission and from the UK National Institute for Health Research. Dr. Shankar-Hari reports grants from National Institute for Health Research UK, grants from UKRI-National Institute for Health Research UK. Dr. Turgeon reports grants from Canadian Institutes of Health Research. Dr. Venkatesh reports grants from Baxter. Dr. Webb reports grants from National Health and Medical Research Council, grants from Minderoo Foundation. Dr. Zacharowski reports grants from EU Horizon 2020. The ASCOT trial team (Drs Bowen, Daly, Davis, Denholm, Hammond, Jha, L. Lim, McQuilten, Molton, Morpeth, O’Sullivan, Paterson, Perry, Price, Rees, Roberts, Rogers, Sasadeusz, Snelling, Tong, Venkatesh, Wood) is funded by grants from from Royal Brisbane and Women’s Hospital Foundation, Pratt Foundation, Minderoo Foundation, BHP Foundation, Hospital Research Foundation, Macquarie Group Foundation, Health Research Council of New Zealand, Australian Partnership for Preparedness Research on Infectious Disease Emergencies (APPRISE), and the collection and supply of convalescent plasma was conducted within Lifeblood’s funding arrangements. The CONFIDENT trial is funded by the Belgian KCE (blood establishments received payment for the convalescent plasma supplied in the clinical trial). REMAP-CAP was supported in part by funding from UKRIDHSC COVID-19 Rapid Response Rolling Call (Grant Reference Number COV19-RECPLAS). Collection of convalescent plasma for REMAP-CAP was funded by the Department of Health and Social Care, UK. The IRCT20200310046736N1 trial was supported by the Ahvaz Jundishapur University of Medical Sciences (Grant No. R.AJUMS.REC.1399.003, Dr. Pouladzadeh). The PC-COVID-19 Group is supported by the Universidad del Rosario, IDCBIS, ISA Group and Suramericana (Colombia). Outside the submitted work, the following is reported: Dr. Axfors reports postdoctoral grants from the Knut and Alice Wallenberg Foundation, Uppsala University, the Swedish Society of Medicine, the Blanceflor Foundation, and the Sweden-America Foundation. Dr. Aomar reports personal fees from SOBI, GEDEON RICHTER, and GSK. Dr. Benfield reports grants from Novo Nordisk Foundation, Simonsen Foundation, Lundbeck Foundation, Kai Hansen Foundation, Erik and Susanna Olesen’s Charitable Fund; grants and personal fees from GSK, Pfizer, Gilead; and personal fees from Boehringer Ingelheim, MSD, and Pentabase ApS. Dr. Estcourt reports being an investigator on the RECOVERY trial. Dr. Gordon reports personal fees from GlaxoSmithKline, Bristol Myers Squibb, and 30 Respiratory. Dr. Jha reports grants and personal fees from Baxter Healthcare, personal fees from Astra Zeneca, grants from NephroPlus. Dr. Laterre reports personal fees from Adrenomed. Dr. McVerry reports grants from NIH/NHLBI and Bayer Pharmaceuticals, Inc. Dr. Mondragon reports financial activities outside the submitted work (employment at Johnson & Johnson). Dr. Perry reports partner being employed at CSL and owning shares in CSL. Dr. Paterson reports involvement with ALLIANCE trial of COVID-19 treatments. Dr. J. Roberts reports other COVID-19 related trials (in different patient groups): tocilizumab in ICU patients; hydroxychloroquine dosing in ICU patients; planned study of remdesivir pharmacokinetics in patients during expanded access program; and in silico evaluation of ivermectin dosing. Dr Sasadeusz reports grants from various Pharma companies including Gilead Sciences, Abvvie, Merck, and Takeda. Dr. Zacharowski reports personal fees from Biotest AG, CSL Behring, GE Heathcare, and is President of the ESAIC., Background: Convalescent plasma has been widely used to treat COVID-19 and is under investigation in numerous randomized clinical trials, but results are publicly available only for a small number of trials. The objective of this study was to assess the benefits of convalescent plasma treatment compared to placebo or no treatment and all-cause mortality in patients with COVID-19, using data from all available randomized clinical trials, including unpublished and ongoing trials (Open Science Framework, https://doi.org/10.17605/OSF.IO/GEHFX). Methods: In this collaborative systematic review and meta-analysis, clinical trial registries (ClinicalTrials.gov, WHO International Clinical Trials Registry Platform), the Cochrane COVID-19 register, the LOVE database, and PubMed were searched until April 8, 2021. Investigators of trials registered by March 1, 2021, without published results were contacted via email. Eligible were ongoing, discontinued and completed randomized clinical trials that compared convalescent plasma with placebo or no treatment in COVID-19 patients, regardless of setting or treatment schedule. Aggregated mortality data were extracted from publications or provided by investigators of unpublished trials and combined using the Hartung–Knapp–Sidik–Jonkman random effects model. We investigated the contribution of unpublished trials to the overall evidence. Results: A total of 16,477 patients were included in 33 trials (20 unpublished with 3190 patients, 13 published with 13,287 patients). 32 trials enrolled only hospitalized patients (including 3 with only intensive care unit patients). Risk of bias was low for 29/33 trials. Of 8495 patients who received convalescent plasma, 1997 died (23%), and of 7982 control patients, 1952 died (24%). The combined risk ratio for all-cause mortality was 0.97 (95% confidence interval: 0.92; 1.02) with between-study heterogeneity not beyond chance (I2 = 0%). The RECOVERY trial had 69.8% and the unpublished evidence 25.3% of the weight in the meta-analysis. Conclusions: Convalescent plasma treatment of patients with COVID-19 did not reduce all-cause mortality. These results provide strong evidence that convalescent plasma treatment for patients with COVID-19 should not be used outside of randomized trials. Evidence synthesis from collaborations among trial investigators can inform both evidence generation and evidence application in patient care., Amalia Bravo-Lindoro, BHP Foundation, Blanceflor Foundation, Department of Foreign Affairs, Trade, and Development of Canada, Eli Omar Zavaleta, Erik and Susanna Olesen’s Charitable Fund, Federal Ministry of Education and Research in Germany, Fundación Telefónica del Perú, IDCBIS, ISA Group and Suramericana, Kai Hansen Foundation, Katja Suter and Sina Ullrich, Khuzestan Blood Transfusion Organization, Macquarie Group Foundation, Medical Research Future Fund, NephroPlus, RBWH, Roel Rolando-Almario NCT04385199, Royal Brisbane, Sheri Renaud, Simonsen Foundation, UKRI-National Institute for Health Research UK, UKRIDHSC COV19-RECPLAS, UP-Philippine General Hospital CTRI/2020/05/025299, NCT04359810, NCT04468009, Women’s Hospital Foundation, National Institutes of Health, National Heart, Lung, and Blood Institute, Pittsburgh Foundation, Pfizer, Baxter International, Stanford University, Gilead Sciences, National Institute on Handicapped Research RP-2015-06-18, Meso Scale Diagnostics, Universität Basel, Laura and John Arnold Foundation, Health Research Board, Pratt Foundation, Canadian Institutes of Health Research, National Institute for Health Research, Department of Health and Social Care, European Commission 101015756, National Health and Medical Research Council, Department of Science and Technology, Ministry of Science and Technology, India, Health Research Council of New Zealand, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Sweden-America Foundation, Bundesministerium für Bildung und Forschung, Lundbeckfonden, Knut och Alice Wallenbergs Stiftelse, Seventh Framework Programme, Ahvaz Jundishapur University of Medical Sciences, Université Pierre et Marie Curie, Uppsala Universitet, Horizon 2020, Svenska Läkaresällskapet, Universidad del Rosario, Pharmaceuticals Bayer, Novo Nordisk Fonden, Department of Science and Technology, Philippines, Philippine Council for Health Research and Development, Minderoo Foundation