ABSTRACT Sargassum sp. can inhibit the growth of pathogenic bacteria Escherichia coli, Staphylococcus aureus, and Vibrio alginolyticus in the category of weak to moderate. The purpose of this study was to determine the inhibitory properties of Sargassum sp. against E. coli, S. aureus, and V. alginolyticus bacteria. This research was conducted in April - May 2019. Sampling was carried out in th…