[Pendahuluan: Penyakit menular di Indonesia masih menjadi permasalahanutama. Salah satu etiologi ISPA tersering ialah Streptococcus pyogenes. Seiringmeningkatnya angka resistensi bakteri terhadap antibiotik lini utama, ekstrakNigella sativa Linn. dikembangkan sebagai alternatif terapi. Biji jintan hitam(Nigella sativa Linn.) dipercaya memiliki potensi efek antibakteri. Penelitian iniditujukan untuk mengetahui potensi aktivitas antibakteri dari ekstrak Nigellasativa Linn.Metode: Percobaan dilakukan di Departemen Mikrobiologi Klinik FKUI. Potensiaktivitas antibakteri diamati melalui tiga percobaan. Percobaan pertamamenggunakan lima konsentrasi berbeda yakni 200 mg/mL, 100 mg/mL, 50mg/mL, 25 mg/mL, 12,5 mg/mL. Percobaan kedua dan ketiga menggunakan limakonsentrasi lain, yakni 1000 mg/mL, 500 mg/mL, 250 mg/mL, 125 mg/mL dan62,5 mg/mL. Ekstrak kemudian diuji secara in vitro dengan metode difusi carasumuran, dibandingkan dengan antibiotik amoksisilin 10 ug/mL sebagai kontrolpositif dan larutan akuades sebagai kontrol negatif. Setiap percobaan dilakukandengan empat kali pengulangan.Hasil: Tidak terdapat zona hambat pada sumuran ekstrak Nigella sativa Linn.Hasil ini berbeda dengan penelitian sebelumnya yang menunjukkan ekstrakNigella sativa Linn. memiliki aktivitas antibakteri terhadap S. Pyogenes. Beberapafaktor yang berpotensi memengaruhi hasil penelitian ialah penggunaan pelarutekstrak, sifat dari bahan dasar biji jintan hitam, serta metode uji, Introduction: Infectious diseases in Indonesia are still a major problem. One ofthe most common etiology of respiratory infection is Streptococcus pyogenes.Several studies have shown an increase of antibiotic resistance for treatment ofStreptococcus pyogenes, extracts of Nigella sativa Linn. was developed as analternative therapy. Black cumin seeds (Nigella sativa Linn.) is believed to havethe potential antibacterial effect. This study aimed to determine the potentialantibacterial activity of extracts of Nigella sativa Linn.Methods: Experiments were performed at the Department of ClinicalMicrobiology, Faculty of Medicine Universitas Indonesia. Potential antibacterialactivity was observed through three experiments. The first experiments using fivedifferent concentrations of the 200 mg/mL, 100 mg/mL, 50 mg/mL, 25 mg/mL,12.5 mg/mL. The second and third experiments using five differentconcentrations, 1000 mg/mL, 500 mg/mL, 250 mg/mL, 125 mg/mL and 62.5mg/mL. Extracts were then tested in vitro using agar well plate method, comparedwith the antibiotic amoxicillin 10 ug/mL as a positive control and aquades as anegative control. Each experiment was tested with four repetitions.Results: There was no inhibition zone on extracts of Nigella sativa Linn. Theseresults differ from previous studies that showed antibacterial activity of Nigellasativa Linn. Some of the factors that could potentially influence the outcome ofresearch is the use of solvent extract, the nature of the basic ingredients of blackcumin seeds, as well as test methods.]