苄青霉素（英语：Benzylpenicillin），也称青霉素G（penicillin G），是一种窄谱青霉素类抗生素，用于静脉注射或肌肉注射治疗儿童的各种细菌感染。通常直接用青霉素指苄青霉素。

苄青霉素被列入世界卫生组织基本药物标准清单，是最重要的基本健康药物之一。

Benzylpenicillin (INN, AAN, BAN), also known as penicillin G, (USAN) is a narrow spectrum penicillin antibiotic that is given intravenously or intramuscularly as a treatment for syphilis, meningitis, endocarditis, pneumonia, lung abscesses and septicaemia in children. Penicillin G is typically given by injection parenterally, bypassing the intestines, because it is unstable in the highly acidic stomach. Because the drug is given parenterally, higher tissue concentrations of penicillin G can be achieved than is possible with phenoxymethylpenicillin. These higher concentrations translate to increased antibacterial activity.