181Williams Syndrome (WS) (威廉氏症)
182Wilson's Disease (WD) (威爾森氏症)
183Wolf–Hirschhorn Syndrome (WHS) (沃夫-賀許宏氏症)
184Wolfram Syndrome
185Worster-Drought Syndrome (WDS)
186WWOX Syndrome (Genetic Disorder)
187Xeroderma Pigmentosum (XP) (著色性乾皮症)
188X-linked Agammaglobulinemia (XLA) (X-連鎖無丙種球蛋白血症)
189X-linked Hypophosphatemic Rickets (XLH) (性聯遺傳型低磷酸佝僂症)
190X-linked Myotubular Myopathy (XLMTM) (肌小管病變)
191X-linked Retinoschisis (XLRS) (Genetic Disorder)
192X-linked Thrombocytopenia (XLT) (Genetic Disorder)