Missed nursing care is an emerging measure of front-line nursing care effectiveness in neonatal intensive care units (NICUs). Given Magnet® hospitals' reputations for nursing care quality, missed care comparisons with non-Magnet® hospitals may yield insights about how Magnet® designation influences patient outcomes. The purpose of this secondary analysis was to evaluate the relationship between hospital Magnet® designation and 1) the occurrence of nurse-reported missed care and 2) reasons for missed nursing care between NICU nurses employed in Magnet® and non-Magnet® hospitals. A random sample of certified neonatal intensive care unit nurses was invited to participate in a cross-sectional survey in 2012; data were analyzed from nurses who provided direct patient care (n = 230). Logistic regression was used to model relationships between Magnet® designation and reports of the occurrence of and reasons for missed care while controlling for nurse and shift characteristics. There was no relationship between Magnet® designation and missed care occurrence for 34 of 35 types of care. Nurses in Magnet® hospitals were significantly less likely to report tensions and communication breakdowns with other staff, lack of familiarity with policies/procedures, and lack of back-up support from team members as reasons for missed care. Missed nursing care in NICUs occurs regardless of hospital Magnet® recognition. However, nurses' reasons for missed care systematically differ in Magnet® and non-Magnet® hospitals and these differences merit further exploration.