This study aims to identify the utilization of repository collection at FMIPA UGM library using Eprints. It is a descriptive study with a quantitative approach. The subjects were librarians utilizing repository collection. The object was repository collection. Methods of data collection in this study were observation, documentation, and questionnaires. Data were analyzed quantitatively. The result of the study showed that the librarian managed to meet the target of uploading as many as 3100 documents in PDF file within 1 month (July 2014) but the proportion based on department was yet as expected. Average utilization of repository collections at FMIPA UGM library was 70.45%. This was considered as very good. The highest score of satisfaction was found in the quality of repository collection (87.75%) and the lowest was in the number of documents used (35.4%). Respondents used repository collection within 1-2 hours per day (80.0%). Respondents read and took notes (80.0%). As many as 87.75% of respondents considered that repository collection of FMIPA library was of good quality, particularly viewed from aspects of currency and relevance to user needs. Keywords: Utilization; repository; E-prints