James Macmahon PC (Ire) (20 April 1865 – 1 May 1954) was an Irish civil servant and businessman.
Macmahon appointed GPO worker Nancy O'Brien due to her dedication and purported lack of interest in politics.
However, O'Brien was a second cousin of Michael Collins, and each day, between 2:30 and 3:30, she would pass any salient information she acquired to either Joe McGrath, Liam Tobin or Desmond FitzGerald.
He remained Under-Secretary until his retirement on the formation of the Irish Free State in 1922.
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