Penelitian ini bertujuan untuk mengetahui perbedaan prestasi belajar mahasiswa yang ikut  dan yang tidak ikut organisasi kemahasiswaan. Penelitian ini termasuk dalam jenis penelitian kausal komparatif dengan menggunakan desain tipe (a) yaitu group possesses characteristic dan group does not possess characteristic. Teknik analisis data menggunakan deskriptif statistik, uji normalitas, dan uji beda Mann Whitney.
            Hasil penelitian menunjukkan bahwa nilai rata-rata IPK mahasiswa yang ikut organisasi sebesar 3.48 dengan nilai terendah 2.73 dan nilai tertinggi 3.88, sedangkan mahasiswa yang tidak ikut organisasi memiliki rata-rata nilai IPK 3.37 dengan nilai terendah 2.59 dan nilai tertinggi 3.75. Hasil uji beda Mann Whitney menunjukkan nilai Z sebesar -3.283 dengan nilai signifikan 0.001 < 0.05. Sehingga dapat disimpulkan bahwa terdapat perbedaan yang signifikan prestasi belajar antara mahasiswa yang ikut dan tidak ikut organisasi kemahasiswaan. Mahasiswa yang ikut organisasi kemahasiswaan cenderung memiliki IPK lebih tinggi dibandingkan dengan mahasiswa yang tidak ikut organisasi kemahasiswaan.    

            Saran untuk penelitian selanjutnya agar menambahkan tolok ukur dari prestasi belajar dikarenakan prestasi belajar tidaklah hanya diukur melalui IPK. Selain itu keaktifan mahasiswa dalam organisasi juga tidak cukup dinilai melalui SK kepengurusan saja, sehingga untuk penelitian selanjutnya disarankan untuk menambahkan instrumen pengukuran keaktifan mahasiswa dalam berorganisasi.

The objective of this study is to determine the differences in learning achievement between students who participate and who do not participate in student organizations. This research belongs to the type of comparative causal research using the type (a) design, namely group possessing characteristic and group does not possess characteristic. The data analysis technique used descriptive statistics, normality tests, and Mann Whitney difference tests.

The results showed that the average GPA of students who participating in the organization was 3.48 with the lowest score of 2.73 and the highest score of 3.88, while the students who did not join the organization have an average GPA of 3.37 with the lowest score of 2.59 and the highest score of 3.75. The results of the Mann Whitney difference test showed a value of Z of -3,283 with a significant value of 0.001 <0.05. So that it can be concluded that there are significant differences in learning achievement between students who participated and do not participate in student organizations. Students who participate in student organizations tend to have a higher GPA than students who do not participate in student organizations.

The suggestion for the next research is to add benchmarks of learning achievement due to learning achievement are not only measured by the GPA. In addition, the students' activeness in the organization is not enough to be assessed through a decision letter of management decree only, so that for further research it is recommended to add instruments for measuring student activeness in joining organization.