This study was carried out to find out factors affecting on organizational commitment of hospital physical therapists in Korea. The sample used in this study consisted of 135 physical therapists who were working in hospitals located in Seoul. The data for analysis were collected by questionnaire survey. The major statistical methods used for the analysis were factor analysis and multiple regression analysis. The dependent variable of the study was organizational commitment (responsibility of organization and propensity to stay), and the independent variables were general characteristic of respondents and components of job satisfaction - "task", "organizational operation system", "opportunity of development", "interpersonal relationship" - of hospital physical therapists. Important factors affecting the responsibility of organizational commitment were religion, work period, task satisfaction, opportunity of development. And propensity to stay was significantly affected by religion, work period, and four components of job satisfaction. In considering above findings, for improving factors affecting on organizational commitment of physical therapists, hospitals need to develop strategies for enhancing job satisfaction by providing the adequate job environment.