Several studies have shown substantially lower attendance in mammographic screening among immigrants versus non-immigrants, particularly among immigrants from non-Western compared to Western countries (1, 2). The general recommendations for breast cancer screening do not take into account immigrant status of the invited women (1, 3). Differences in screening participation by immigrant status represent a potential for inequalities in healthcare access (2, 4). However, to address the issue and plan intervention measures to reduce the inequalities, the main immigrant groups and their screening attendance should be mapped. Our aim was therefore to explore attendance among women invited to BreastScreen Norway by region of birth.