To enable improvements in school health promotion, this paper examines associations between the number of health-promotion issues addressed by primary school teachers in the Netherlands and factors thought to influence this behavior. The main factors studied are context characteristics and constructs of attitude, social influence, self-efficacy (SE) and perceived barriers. A total of 180 primary school teachers teaching 9- to 12-year olds (Grades 6, 7 and 8) participated in a cross-sectional survey. The results show that it is possible to differentiate between teachers addressing three or more health issues per year versus those who address fewer based on grade level (more health issues are addressed at higher grades), perceived disadvantages, SE and staff support. The latter seems to exert the greatest influence and may be one of the most promising focus points for improvements of school health promotion in the Netherlands.