ABSTRACT This research aims to determine the effect of red calliandra (Calliandra calothyrsus Meissn.) leaf extrac on the histological structure of the kidney of mice (Mus musculus L.). Treatment was administered orally with varying doses. This research used a Completely Randomized Design in factorial pattern of two factors, doses (0 or control, 2, 4, and 6 mg/kg BW) and length of treatmen…