Tujuan penelitain ini untuk mengetahui Pengaruh Model Pembelajaran Project Based Learning (PjBL) Terhadap Hasil Belajar Siswa Kelas XI SMA Muhammadiyah Tarakan. Penelitian ini dilakukan selama bulan April – Mei, 2015 di SMA Muhammadiyah Tarakan. Penelitian ini menggunakan eksperimen semu dengan populasi seluh siswa kelas XI SMA Muhammadiyah Tarakan tahun ajaran 2014 – 2015, dan sampel yaitu kelas XI IPA 1 sebagai kelas eksperimen dan kelas XI IPA 2 sebagai kelas kontrol. Teknik pengambilan sampel menggunakan purposive sampling dan teknik pengumpulan data menggunakan dokumentasi dan observasi, data dianalisis menggunakan software SPSS 16.0 For Windows. Berdasarkan hasil analisis data dapat disimpulkan bahwa terdapat Pengaruh Model Pembelajaran Project Based Learning (PjBL) Terhadap Hasil Belajar Siswa Kelas XI SMA Muhammadiyah Tarakan. Karena nilai thitung yang diperoleh sebesar 20.170 lebih besar dari ttbael 1,671.

The method used in this research was the quasy experiment method. The population of this research consists of the elevent grade students of science program (XI IPA) at SMA Muhammadiyah Tarakan in the academic year of 2014/2015. The samples of this research are the students of XI IPA 1 as the treatment class and the students of XI IPA 2 as the control class. The sample data was taken by using purposive sampling. The tecnicque of data collection in this research was documentation and observation. The data was analyzed by using SPSS Windows Program. Based on the result of the analysis of the data, it can be concluded that there is a correlation between Project Based Learning (PjBL) model and the eleventh grade students’ af SMA Muhammadiyah Tarakan achievements in the learning process. It can be see by the student’s score, 20.170 which is bigger than 1.671.