The inflammatory myofibroblastic tumor (IMT) is a rare lesion, particularly in the urinary bladder. Inflammatory myofibroblastic tumor mainly affects children and young adults. It is unknown neoplastic potential, characterized by spindle cell proliferation with characteristic fibroinflammatory and pseudo-sarcomatous appearance. We describe a 36-year-old Moroccan man, who presented with hematuria the last week. The cystoscopy found a large bladder mass with necrotic-looking floating lesions, located in the trigonal area and left lateral wall on the dome of the urinary bladder. The patient underwent transurethral resection of the bladder tumor (TUR-BT). The histopathology and immunohistochemistry showed an IMT. No evidence of regrowth or residual tumor in 9 months of follow-up cystoscopy. In conclusion, even though, urinary bladder IMT is a rare occurrence, it is associated with a good prognosis. Histopathology investigation and immunohistochemistry analysis are essential to confirm the diagnosis. Complete TUR-BT is the treatment of choice.