The research aims to determine the level of plankton abundance and diversity in the Wiringtasi River, Barru Regency, South Sulawesi, Indonesia. The research was conducted from August to September 2024 at three research locations, namely location 1, namely the river location adjacent to rice fields; location 2, namely the river area adjacent to ponds and beaches; and location 3, namely the location around the mouth of the Wiringtasi River, Barru Regency. Water samples obtained at the research location were taken to the laboratory for analysis. The plankton samples obtained were calculated for abundance, species diversity, species uniformity, and dominance index. The data obtained was then processed and analyzed using descriptive analysis. The results showed that the highest abundance of plankton was in the Melosira sp. type plankton (location 1) and Navicula sp. type plankton (locations 2 and 3). The level of diversity and uniformity of plankton at the research location was highest at location 1, namely the location adjacent to the rice fields. The highest level of plankton dominance is found in the Melosira sp type plankton (location 1), while in locations 2 and 3, the plankton is dominated by the Navicula sp type.