This thesis reports the findings of a study issues concerning the adoption of internet banking in Iran. This study investigates costumers’ adoption within the context of Iran Internet Banking services and research framework is based on the extension of Technology Acceptance Model with Theory of Planned behavior and Trust. Theory was developed to identify factors that would influence the adoption of Internet banking. The framework includes Attitude, subjective norm, Perceived behavioral control, Perceived usefulness, Perceived ease of use, Trust and intention constructs. Survey was conducted to gather the data. Partial Least Square was used to examine the entire pattern of inter- correlations among the thirteen proposed constructs and to test related propositions empirically. Results show that Attitude, Perceived behavioral control, Perceived usefulness, Perceived ease of use, Trust significantly influence customers’ intention toward adopting Internet banking. Theoretical contributions and practical implications of the findings are discussed and suggestions for future research are presented.