Abstractobjectives In the Tanzanian health system, women are expected to first visit their nearest front-line health facility (FLF) for delivery. However, women frequently bypass these FLF. Our study estimates the extent of bypassing for childbirth and assesses factors associated with this behaviour.methods Data describing the experiences of 597 women who recently delivered at a facility and the EmONC service capability at 107 health facilities were collected in 2011. Women who did not deliver at their nearest FLF were considered 'bypassers'. Factors associated with bypassing were assessed using multivariate logistic regression models. Three sets of analyses were conducted: among 597 women who delivered at the first facility they visited, among 521 women with no previous complications, and among 407 women not primigravida and without previous complications. conclusions Bypassing is highly associated with EmONC SF score at nearest FLF, controlling for individual and community-level factors.keywords health-seeking behaviour, bypassing, facility delivery, quality of care, emergency obstetric and newborn care, multilevel analysis, Tanzania