A Study of LY3841136 Compared With Placebo in Adult Participants With Obesity or Overweight

Inclusion Criteria: W8M-MC-LAA1 * Are males and females who agree to abide by the reproductive and contraceptive requirements W8M-MC-CWMM: * Have a body mass index (BMI) * ≥30 kilogram/square meter (kg/m²), or * ≥27 kg/m² and \<30 kg/m², or with at least 1 weight-related comorbidity * Have had a stable body weight for the 3 months prior to randomization (\<5%) body weight gain and/or loss. Exclusion Criteria: W8M-MC-LAA1 * Have any prior diagnosis of diabetes mellitus except gestational diabetes. * Have any of the following cardiovascular conditions within 6 months prior to screening: * acute myocardial infarction * cerebrovascular accident (stroke) * unstable angina, or * hospitalization due to congestive heart failure (CHF). * Have a history of acute or chronic pancreatitis. * Have an on-going or history of bradyarrhythmia and/or sinus bradycardia at screening and baseline. W8M-MC-CWMM * Have a prior or planned surgical treatment for obesity, except prior liposuction or abdominoplasty, if performed \>1 year prior to screening. * Have type 1 diabetes mellitus, latent autoimmune diabetes in adults, or history of ketoacidosis or hyperosmolar coma. * Have poorly controlled hypertension. * Have a history of symptomatic gallbladder disease within the past 2 years * Have signs and symptoms of any liver disease other than nonalcoholic fatty liver disease. * Have a lifetime history of suicide attempts.