Employees often remain silent rather than speak up to managers with work-relatedideas, concerns, and opinions. As a result, managers can remain in the dark about issuesthat are otherwise well known to, or universally understood by, frontline employees. Wepropose a previously unexplored explanation for this phenomenon: Voice is prone to“bystander effects,” such that, the more certain information is shared among employees,the less any particular employee feels individually responsible for bringing up thatinformation with managers. We theorize that such bystander effects are especially likelyto occur when peers of focal employees, on average, enjoy high-quality relationshipswith managers and thereby have adequate relational access to voice up the hierarchy.Using a correlational study involving managers and employees working in teams in aFortune 500 company, as well as two experimental studies (a laboratory study involvingundergraduate students working in a hierarchical setting, and a scenario study with asample of U.S.-based workers), we provide evidence for our conceptual model. We alsodiscuss the theoretical and managerial implications of our findings.