Trichosporon asahii is an emerging opportunistic fungal pathogen increasingly identified in immunocompromised hosts. We report a rare case of urinary tract infection (UTI) caused by T. asahii in a 6-year-old girl with nephrotic syndrome undergoing prolonged corticosteroid therapy. The diagnosis was confirmed at the Parasitology-Mycology Laboratory of the Mohammed VI University Hospital in Marrakech. This case highlights the diagnostic challenges, antifungal resistance patterns, and therapeutic considerations associated with this unusual infection in pediatric patients.