Background: Patient safety culture/climate in maternity units has been linked to better safety outcomes. Nurses have a crucial role in patient safety and represent the majority of staff in maternity units. In many countries, nurses are recruited from abroad, bringing their own perceptions of patient safety culture. Nonetheless, little is known about the relationship between perceptions of patient safety culture and nurses’ nationality. Understanding this relationship will assist stake-holders in designing a responsive programme to improve patient safety culture. Aims: To investigate the association between nurses’ nationality and their perceptions about patient safety culture in maternity units in Ministry of Health hospitals in Oman. Methods: In 2017, the Safety Attitude Questionnaire (SAQ) was distributed to all staff (892 distributed, 735 returned) in 10 maternity units. Results: About three-quarters (74%, 541/735) of the returned SAQs were completed by nurses, of whom 34% were non-Om-ani, 21.8% were Omani and 44.7% did not report their nationality (missing). Overall, the mean safety score for non-Omani nurses was significantly higher than for the Omani nurses: 3.9 (SD 1.3) vs 3.6 (SD 1.2) (P 0.001). The mean safety score for stress recognition was significantly lower for non-Omani nurses: 2.8 (SD 1.5) vs 3.2 (SD 1.3) (P 0.001). Conclusion: Non-Omani nurses have a more positive perception of patient safety culture than Omani nurses except in respect of stress recognition. Decision-makers, directors, and clinicians should consider these differences when designing interventions to improve patient safety culture.