Kyphosis (kyphosis) is a disorder in the curvature of the spine that makes the upper back appear abnormally rounded or bent. Everyone has a curved spine, ranging from 25 to 45 degrees. However, in people with kyphosis, the curvature of the spine can reach 50 degrees or more. These conditions make people hunchbacked. Kyphosis is still difficult or rare to find so it is difficult for sufferers to consult their experts (Kofosis diagnosis specialists) to obtain information related to the diagnosis of the disease they are experiencing. The expert system built in this study to diagnose Kofosis was designed and built using the Visual Basic Net 2008 programming language, as with the development of this expert system, it is expected to have a positive impact as an alternative tool for diagnosing Kofosis in sufferers of this disease. In the expert system for diagnosing Kofosis in this study, the mamdani fuzzy logic method is applied with the aim of increasing the progress of the system's work in producing accurate diagnostic output and in accordance with the expert knowledge obtained by the author when conducting research on this Kofosis disease.Keywords: Expert System, Diagnosis, Cofosis, Fuzzy Mamdani
                        
                        
                        
                        
                            
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