William Mayo is the name of:

• William B. Mayo (1866-1944), former chief engineer of the Ford Motor Company
• Two co-founders of the Mayo Clinic:
  • William Worrall Mayo (1819-1911)
  • William James Mayo (1861-1939)
• William Mayo (MP) (died 1723), English Member of Parliament
• William Mayo (civil engineer) (c.1685-1744), who laid out the city of Richmond, Virginia
• William Mayo (vicar), the vicar of Folke, Dorset, England in about 1845.
• William Leonidas Mayo, founder (in 1889) and first president of East Texas Normal College.
• William Starbuck Mayo, (1812-1895), American doctor, traveler and writer

• Pendeulwyn
• Pendi
• Pendicici
• Pendik S.K.
• Pendilium
• Pendinas
• Pendine, Carmarthenshire
• Pendine museum of speed
• Pendine Sands, Carmarthenshire
• Pending
• Pending changes
• Pending freight
• Pending trial
• PEN (disambiguation)
• Pendičići
• Pendle (borough)
• Pendlebury Colliery
• Pendlebury, Greater Manchester
• Pendlebury, Lancashire
• Pendle Community Hospital
• Pendle hill quaker center for study and contemplation
• Pendle Hill railway station, Sydney
• Pendleton Act of 1883
• Pendleton Army Airfield
• Pendleton Bridge railway station