Abstract. Patients' viewpoints are commonly used to assess quality of care in diverse healthcare organizations. The purpose of the current study is to investigate quality gap of family health care through measuring differences between clients' perceptions and expectations at Kashan city health centers in Iran. A cross-sectional design was applied in 2013. The study sample was composed of 384 women clients of family health services randomly selected from Kashan city health centers. The SERVQUAL questionnaire was used for data collection. Service quality gap was measured by computing the difference between the rating respondents assign to expectations and perceptions statements. For pair wise comparison of the expectations and perceptions the Wilcoxon Signed Rank test was used. Internal consistency of the scale was confirmed with Cronbach's Alpha coefficients.In all dimensions of the services a significant (P<0.001) negative quality gap was observed. The maximum quality gap was in the tangibility (-0.60±0.37) and the minimum one was in the responsiveness (-0.41±0.31) dimension. The findings of the research demonstrated that there was negative gap between clients' expectations and perceptions in all dimensions of the services. Thus, family health care managers should apply improvements in all five dimensions of the services.