Abstract. The study explored the internal school managers’ strategies of financial resources mobilization for complementing fee free education in Meru District Public secondary schools. Resource dependence theory together with a case study design under qualitative approach were adopted. Systematic random and purposive sampling were used to sample 53 participants from 1878 including head of schools, bursars, school board members and teachers. Data were collected through questionnaire, interview guide and analysed thematically and descriptively. Expert review ensured Trustworthiness of research instruments. The findings showed that, the internal school managers’ strategies of financial resources mobilization are school project, fundraising and student handcraft. The study concludes that, the internal school managers’ strategies of financial resources mobilization are ineffective as funds generated are not enough compared to funds needed for schools’ operation. The study recommended that school administrators and board members should have convincing power and attend training, teachers should encourage students in extracurricular activities.