James Macmahon

{{Short description|Irish civil servant and businessman}}

{{For|those of a similar name|James McMahon (disambiguation)}}

{{Use dmy dates|date=November 2020}}

{{Use Irish English|date=November 2020}}

{{Infobox officeholder

| honorific_prefix = The Right Honourable

| name = James Macmahon

| honorific_suffix =

| image =

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| office = Under-Secretary for Ireland

| term_start = 1918

| term_end = 1922

| birth_name =

| birth_date = {{Birth date|1865|04|20|df=yes}}

| birth_place = Belfast, Ireland

| death_date = {{Death date and age|1954|05|01|1865|04|20|df=yes}}

| death_place =

| nationality =

| other_names =

| occupation = Civil servant, businessman

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}}

James Macmahon PC (Ire) (20 April 1865 – 1 May 1954) was an Irish civil servant and businessman.Obituary, The Times, 3 May 1954

Macmahon was born in Belfast and raised as a Roman Catholic. He was educated at St Patrick's College, Armagh and Blackrock College in Dublin. He joined the Irish Post Office, being promoted to Assistant Secretary in 1913 and Secretary in 1916. In 1918, he became Under-Secretary for Ireland.

There was a need to decode the coded messages sent to the Dublin Castle administration from London. 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.{{Cite news|url=http://www.irishtimes.com/culture/the-light-of-other-days-1.105606|title=The light of other days|last=FitzGerald|first=Garret|author-link=Garret FitzGerald|newspaper=The Irish Times|date=12 September 1997|accessdate=23 March 2016}}

Macmahon was appointed to the Privy Council of Ireland in the 1920 New Year Honours,{{London Gazette |issue=31712 |date=30 December 1919 |page=2 |supp=y}} entitling him to the style "The Right Honourable". He remained Under-Secretary until his retirement on the formation of the Irish Free State in 1922. He went into business in Dublin. In 1947, he was elected president of the Royal Dublin Society. He died on 1 May 1954, aged 89.