Background: GLP-1 receptor agonists reduce major adverse cardiovascular events (MACE) in patients with type 2 diabetes. However, uncertainty regarding kidney outcomes persists and whether benefits extend to exendin-4-based GLP-1 receptor remains uncertain. We aimed to meta-analyse the most up-to-date evidence on the cardiovascular benefits and risks of GLP-1 receptor agonists from outcome trials in patients with type 2 diabetes., Methods: We did a meta-analysis, including new data from AMPLITUDE-O, using a random effects model to estimate overall hazard ratio (HR) for MACE; its components; all-cause mortality; hospital admission for heart failure; a composite kidney outcome consisting of development of macroalbuminuria, doubling of serum creatinine, or at least 40% decline in estimated glomerular filtration rate (eGFR), kidney replacement therapy, or death due to kidney disease; worsening of kidney function, based on eGFR change; and odds ratios for key safety outcomes (severe hypoglycaemia, retinopathy, pancreatitis, and pancreatic cancer). We also examined MACE outcome in patient subgroups on the basis of MACE incidence rates in the placebo group, presence or absence of cardiovascular disease, HbA 1c level, trial duration, treatment dosing interval, structural homology to human GLP-1 or exendin-4, BMI, age, and eGFR. We searched PubMed for eligible trials reporting MACE (ie, cardiovascular death, myocardial infarction, or stroke), up to June 9, 2021. We meta-analysed data from published randomised placebo-controlled trials testing either injectable or oral GLP-1 receptor agonists in patients with type 2 diabetes. We restricted the search to trials of more than 500 patients with a primary outcome that included cardiovascular death, non-fatal myocardial infarction, and non-fatal stroke. This meta-analysis was registered on PROSPERO, CRD42021259711., Findings: Of 98 articles screened, eight trials comprising 60 080 patients fulfilled the prespecified criteria and were included. Overall, GLP-1 receptor agonists reduced MACE by 14% (HR 0·86 [95% CI 0·80-0·93]; p<0·0001), with no significant heterogeneity across GLP-1 receptor agonist structural homology or eight other examined subgroups (all p interaction ≥0·14). GLP-1 receptor agonists reduced all-cause mortality by 12% (HR 0·88 [95% CI 0·82-0·94]; p=0·0001), hospital admission for heart failure by 11% (HR 0·89 [95% CI 0·82-0·98]; p=0·013), and the composite kidney outcome by 21% (HR 0·79 [95% CI 0·73-0·87]; p<0·0001), with no increase in risk of severe hypoglycaemia, retinopathy, or pancreatic adverse effects. In sensitivity analyses removing the only trial restricted to patients with an acute coronary syndrome (ELIXA), all benefits marginally increased, including the outcome of worsening of kidney function, based on eGFR change (HR 0·82 [95% CI 0·69-0·98]; p=0·030)., Interpretation: GLP-1 receptor agonists, regardless of structural homology, reduced the risk of individual MACE components, all-cause mortality, hospital admission for heart failure, and worsening kidney function in patients with type 2 diabetes., Funding: None., Competing Interests: Declaration of interests NS has consulted for Amgen, AstraZeneca, Boehringer Ingelheim, Eli Lilly, Hanmi, MSD, Novartis, Novo Nordisk, Pfizer, and Sanofi; and received grant support from Boehringer Ingelheim, outside the submitted work. MMYL's employer, the University of Glasgow, has received grant support from Boehringer Ingelheim. SLK reports speaker fees from AstraZeneca, outside the submitted work. KRHB reports research grant funding from Bayer, Sanofi, and Eli Lilly; and consultation fees from Amgen, Bayer, Janssen, Sana, and Kestra. RDL reports research grants and personal fees from Bristol-Myers Squibb and Pfizer; personal fees from Boehringer Ingelheim and Bayer; and research grants from Amgen, GlaxoSmithKline, Medtronic, and Sanofi Aventis, outside the submitted work. CSPL has received research support from AstraZeneca, Bayer, Boston Scientific, and Roche Diagnostics; has served as consultant or on the advisory board, steering committee, or executive committee for Actelion, Amgen, Applied Therapeutics, AstraZeneca, Bayer, Boehringer Ingelheim, Boston Scientific, Cytokinetics, Darma, Us2.ai, Janssen Research & Development, Medscape, MSD, Novartis, Novo Nordisk, Radcliffe Group, Roche Diagnostics, Sanofi, and WebMD Global; and serves as co-founder and non-executive director of Us2.ai. SDP consulted for Applied Therapeutics, AstraZeneca, Boehringer Ingelheim, Eli Lilly, MSD, Novartis, Novo Nordisk, and Sanofi; received grant support from AstraZeneca and Boehringer Ingelheim; and speaker fees from AstraZeneca, Boehringer Ingelheim, Eli Lilly, MSD, Novartis, Novo Nordisk, and Sanofi. JJVM acknowledges payments to his employer, the University of Glasgow, for his work on clinical trials, consulting, and other activities from Alnylam, Amgen, AstraZeneca, Bayer, Boehringer Ingelheim, Bristol Myers Squibb, Cardurion, Cytokinetics, Dal-Cor, GlaxoSmithKline, Ionis, KBP Biosciences, Novartis, Theracos; personal lecture fees from Abbott, Alkem Metabolics, Eris Lifesciences, Hikma, Lupin, Sun Pharmaceuticals, Medscape/Heart.Org, ProAdWise Communications, Radcliffe Cardiology, Servier, and the Corpus. JR has participated in advisory panels for Boehringer Ingelheim, Intarcia Therapeutics, Applied Therapeutics, Eli Lilly, Hanmi, Novo Nordisk, Sanofi, Oramed, and Zealand Pharma; and has received research support from Applied Therapeutics, GlaxoSmithKline, Pfizer, Intarcia Therapeutics, Genentech, MSD, Eli Lilly, Novartis, Novo Nordisk, Sanofi, Hanmi, and Oramed. REP reports grants from Hanmi; grants from Janssen and Poxel SA; consulting fees from MSD, Scohia, and Sun Pharmaceutical Industries; grants, speaker fees, and consulting fees from Novo Nordisk; consulting fees from Pfizer; and grants and consulting fees from Sanofi. REP's services were paid for directly to AdventHealth, a non-profit organisation. HCG holds the McMaster-Sanofi Population Health Institute Chair in Diabetes Research and Care. He reports research grants from Eli Lilly, AstraZeneca, MSD, Novo Nordisk, and Sanofi; honoraria for speaking from Boehringer Ingelheim, Eli Lilly, Novo Nordisk, Sanofi, DKSH, and Zuellig; and consulting fees from Abbott, Covance, Eli Lilly, Novo Nordisk, Sanofi, Pfizer, Kowa, and Hanmi., (Copyright © 2021 Elsevier Ltd. All rights reserved.)