Students' attitudes towards plagiarism and academic misconduct have been found to vary across national cultures, although the relationship between national culture and students' perceptions of plagiarism policy remains unexplored. Student survey data (n = 1757) from the UK, Czechia, Poland and Romania were analysed for differences in students' perceptions of three specific aspects of plagiarism policy -- access, support and detail -- at their respective universities. Considered through the lens of Hofstede's cultural dimensions, the study found significant differences between the UK and the three Eastern European countries for all measures except students' awareness of the penalties applied for plagiarism. Low 'power distance' and high 'individualism' were related to positive perceptions of plagiarism policy and process. The findings suggest that institutional plagiarism policy and procedures need to be responsive to the unique characteristics of national cultural context.