John Joseph (Sean) Liddy (1890–1965) was an Irish politician and founder member of the Garda Síochána (the police force of the Republic of Ireland). On his retirement, he also founded and became the first President of the Garda Pensioners Association (1961–1966), later to be renamed the Garda Síochána Retired Members Association (GSRMA).
In the 1921 elections, he was elected unopposed to the 2nd Dáil as a Sinn Féin TD for the constituency of Clare. He supported the Anglo-Irish Treaty and voted in favour of it. He was re-elected unopposed as a pro-Treaty Sinn Féin TD at the 1922 general election. He resigned as a TD on 18 December 1922.
He died as a result of a motor accident in March 1965.
- "Mr. Sean Liddy". Oireachtas Members Database. Retrieved 20 March 2012.
- "Sean Liddy". ElectionsIreland.org. Retrieved 20 March 2012.
- "Lidy Medal". Garda Síochána Retired Members Association. Retrieved 20 March 2012.
- "Retired Garda Sergeant honoured". The Munster Express. 30 March 2007. Retrieved 5 September 2008.
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