Patrick Shanahan may refer to:

• Patrick M. Shanahan (born 1962), acting United States Secretary of Defense
• Patrick Shanahan (politician) (1908–2000), Irish Fianna Fáil politician
• Patrick Shanahan (Medal of Honor) (1867–1937), United States Navy sailor
• Patrick Shanahan, drummer for Rick Nelson's Stone Canyon Band and for the New Riders of the Purple Sage

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• Staudinger's ciliate blue
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• Staughton, Christopher