Objective: Nowadays, inhalation techniques have an important role in treatment of asthma and chronic obstructive pulmonary disease (COPD). Correct application of inhalation devices is important for optimal therapeutic efficacy. Showing inhalation techniques to patients receiving inhaler therapy in more than one visit reduce the device usage errors. It is important to observe the deficiencies and errors of the patients in the primary health care where the patients frequently admitted. In our study we aimed to evaluate the knowledge of family physians on inhaler device usage in their clinical practice.