Penelitian ini bertujuan untuk Menganalisis Capaian Kemampuan Literasi Sains Siswa SMA Negeri Kelas XI MIA di Kabupaten Nunukan menggunakan instrumen Scientific Literacy Assessment (SLA). Metode penelitian ini menggunakan pendekatan kuantitatif dengan jenis deskriptif. Subjek penelitian siswa SMA Negeri kelas XI MIA di Kabupaten Nunukan yang terdiri dari 4 sekolah yaitu SMA Negeri 1 Nunukan, SMA Negeri 2 Nunukan, SMA Negeri 1 Nunukan Selatan dan SMA Negeri 2 Nunukan Selatan. Penentuan sampel menggunakan teknik proportionate sampling. Data peroleh berdasarkan hasil tes soal Scientific Literacy Assessment (SLA) dalam bentuk soal pilihan ganda sebanyak 20 soal dengan alternatif pilihan jawaban a,b,c,d,dan e, yang terbagi ke dalam empat aspek. Aspek tersebut meliputi aspek peran sains, aspek berpikir dan bekerja secara ilmiah, aspek sains dan masyrakat aspek matematika dan sains. Rerata capaian kemampuan keempat sekolah sebesar 43,53 dengan kategori rendah. Rata-rata capaian cemampuan literasi sains siswa SMA Negeri 1 Nunukan sebesar 40,94. SMA Negeri 2 Nunukan sebesar 42,59. SMA Negeri 1 Nunukan Selatan sebesar 45,24 dan SMA Negeri 2 Nunukan Selatan 45,34.

This research aimed to analyze the Scientific Literacy Ability Achievement of State Senior High School Students at Grade XI MIA in Nunukan Regenicy using Scientific Literacy Assessment (SLA) instrument. This research used descriptive quantitative approach. The research subjects were State Senior Higth School Students at Grade XI MIA in Nunukan Regency consisting of 4 schools: StateSenior High School 1 Nunukan, State Senior High School 2 Nunukan, State SeniorHigh School 1 South Nunukan, and State Senior High School 2 South Nunukan The samples were taken using proportionate sampling technique. Thedata were obtained based on the results of test on Scientific Literacy Assessment (SLA) with 20 multiple choice questions with alternative choices of a, b,c, d, and e, divided into four aspects. The aspects included science's role aspect, thinking anworking scientifically aspect, scientific and community aspect and mathematical and scientific aspect. The average ability achievement of the four schoolswas 43.53, classified as low category. The average achievement of students' scientific literacy ability of State Senior High School 1 Nunukan was 40.94, State Senior High School 2 Nunukan of 42.59, State Senior High School 1 South Nunukan of 45.24 andState Senior High School 2 South Nunukan of 45.34.