AbstrakTujuan penelitian adalah untuk mengetahui evaluasi pembelajaran online berbasis Moodle pada mata kuliah Sistem Operasi dari aspek: (1) Kemampuan mahasiswa memakai Moodle; (2) Kemampuan dosen memakai Moodle; dan (3) Keaktifan komunikasi mahasiswa dan dosen dalam penggunaan Moodle pada mata kuliah Sistem Operasi. Metode penelitian yaitu deskriptif. Subjek penelitian adalah mahasiswa dan dosen yang terkait dengan mata kuliah Sistem Operasi. Teknik pengumpulan data menggunakan: (1) Angket, untuk memperoleh informasi dari mahasiswa; (2) Dokumentasi, yaitu menganbil data log pada Moodle; dan (3) Wawancara, untuk memperoleh data dari dosen pengampu berkaitan dengan kemampuan dan aktivitas. Teknik analisis data menggunakan analisis deskriptif. Hasil penelitian menunjukkan bahwa: (1) Mahasiswa mampu menggunakan fitur seperti mengunduh materi, mengunggah tugas, quiz secara online; (2) Dosen sudah mampu menggunakan fitur dasar Moodle; dan (3) keaktifan mahasiswa dan dosen masih kurang karena belum optimal menggunakan komunikasi melalui fitur forum dan chatting yang ada di Moodle. AbstractThe purpose of this research was to determine the evaluation of Moodle-based online learning in the Operating Systems course in aspects of: (1) The ability of students to use Moodle; (2) The ability of lecturers to use Moodle; and (3) The activeness of student and lecturer communication in the use of Moodle in the Operating Systems course. The research method was descriptive. Research subjects were students and lecturers related to the Operating Systems course. Data collection techniques used: (1) Questionnaire, to obtain information from students; (2) Documentation, which is to take log data on Moodle; and (3) Interviews, to obtain data from supporting lecturers related to abilities and activities. Data analysis techniques used descriptive analysis. The results showed that: (1) Students were able to use features such as downloading material, uploading assignments, quizzes online; (2) Lecturers have been able to use the basic features of Moodle; and (3) the activeness of students and lecturers is still lacking because it is not yet optimal in using communication through the forum and chat features available in Moodle.