This study examines differences based on school gender in the teaching of Civic, Social and Political Education (CSPE), a mandatory subject in the Irish post-primary curriculum. These differences are considered in relation to Westheimer and Kahne's three types of citizens -- personally responsible, participatory and justice-oriented. The article presents the findings of a survey conducted with 223 CSPE teachers in single-sex female, single-sex male and co-educational schools. The data were analysed using statistical and thematic analysis. The findings suggest that CSPE teachers in single-sex female schools place greater value on the subject and are more likely to promote social responsibility and student voice, suggesting a greater emphasis on participatory and justice-oriented citizenship. Teachers in single-sex male schools are more likely to focus on politics and action aligning with participatory citizenship. In co-educational schools, teachers seemed to focus on personally responsible and participatory citizenship.