Abstract: Background: Urothelial carcinoma is the most common type of bladder cancer. WHO Classification of Tumors of Urinary System and Male Genital Organs 2016 classifies urothelial carcinoma based on its histological structure and cell morphology, namely, low grade urothelial carcinoma (LGUC) and high grade urothelial carcinoma (HGUC). Tumor grading should be reported because it is one of the important prognostic factors in infiltrating urothelial carcinoma. Tumor budding has been extensively studied and has been established as a prognostic factor in several types of carcinoma where it has independent predictive and prognostic relevance. Research on tumor budding is still very rarely done on infiltrating urothelial carcinoma and in Indonesia there are no published journals related to tumor budding on infiltrating urothelial carcinoma.