This study is executed with the goal of measuring the effects of formal organizational structure on organizational communication. The effects of degrees of the dimensions of formal organizational structure which are centralization, complicacy and formalization on organizational communication are investigated via staff working in Bandırma State Hospital. Staff working in Bandırma State Hospital constitutes the universe of this research. Research was conducted to 162 doctors, nurses, technicians, administrative staff and janitors choosed by convenien sampling As data collecting tool, a survey composed from questions intending to determine the effects of formal organizational structure on organizational communication was used. Correlation Analysis, LSD Test, ANOVA, T-Test, Arithmetic Mean, Standard Deviation and Frequency Analyses were used to analyses the research data. In consequence of the research, it is concluded that the degrees of centralization, vertical differentiation, horizontal differentiation, specialization (expertise), field of supervision (auditing) and formalization did not have negative effects on organizational communication. However, it is observed that the staff showed a low level of participation to the segmentation, and the segmentation caused communication complications, also the form of segmentation was not compatible with the job and thus caused to communication and coordination issues in the public hospital in which the research was conducted. In this context, it is believed that in order to make the organizational structure work better for the job purposes, it is necessary for departments to be reformed and reorganized to be compatible with the job and the authorization borders of the personnel should be clarified during the construction of the planned structure.