SUMMARY
In the digital era, almost all students in the world need Open Educational Resources (OER) to study, including English as a foreign language (EFL) students. They use OER as a tool to improve language skills such as writing skills. The purpose of this study was to find out the students’ perception of using OER in the writing skill and to identify factors that affect students’ perception of using OER in the writing skill. A quantitative approach in the form of a descriptive survey design was used in this study. The study was conducted at Universitas Islam Negeri Raden Mas Said Surakarta, Indonesia with 270 EFL students as the participants. The survey adopted two previous studies whose the data were analyzed by using the descriptive analysis, Pearson product-moment, and multiple regression analysis. The finding revealed that most of the students had quite positive perceptions toward the use of OER in the writing skill. Perceptions of using OER are influenced by interest factors (type of writing activity, type of learning writing delivery), experience factors (teaching effectiveness in the writing skill, cost of education), and from the participants including the gender. It is crucial to maximize the use of OER from different aspects, including quality, value, cognitive, affective, and course quality particularly to increase their perception value toward the use of OER in the writing skill.