This study arises from the convergence between two distinct research areas: Ethnomathematics and Fractal Geometry, thus originating Fractal Ethnogeometry. The objective is to investigate the presence of fractals in different cultures, especially in their architecture. The research is conducted qualitatively, using a bibliographic approach and a phenomenological method, with data analysis through the perspectives of Ideographic and Nomothetic Analysis. The investigative movement allowed the constitution of three Nuclei of Understanding, with which it was possible to articulate the presence that is questioned in the research question, namely: Fractal Ethnogeometry expressed in spontaneous architectural works of antiquity; Fractal Ethnogeometry expressed in architectural works, design, contemporary cities and natural landscapes and Fractal Ethnogeometry as the construction of interdisciplinary knowledge in architecture and in the classroom using technology. These nuclei of understanding intersect, highlighting the importance of Fractal Ethnogeometry.