Adsorption is considered the most efficient and simple method that requires low costs. In this study, firstly, yeast (Saccharomyces cerevisiae) was used to adsorption the Remazol Red RB dyes to analyze the efficiency of yeast as an adsorbent of textile dyes as well as determine the particle size, pH, and optimum contact time. Testing of the particle size parameters was done with variations of 100, 170, and 200 mesh size. The optimum condition was obtained in the particle size variation

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... to 200 mesh size with efficiency %E of 56.49%. Subsequent testing was conducted with variations in pH (5.6, 7, 8, and 9). The optimum condition was obtained at pH 6 with efficiency %E of 60.35%. The dyestuffs were conquerable with variations in time of 1, 2, 3, 4, and 5 hours, the largest %E gained was 90.01% throughout 4 hours. Secondly, the research also aimed at identifying the isotherm adsorption pattern. Adsorption in Remazol Red RB dyes fulfilled the isotherm pattern of Langmuir with a correlation coefficient R 2 of 0.9521 and the maximum capacity of the yeast adsorption of 0.07 mg/g. Further research is expected to expand the analysis variation and the type of textile dyes used which can be applied to the actual textile dyes waste.