Old IRA may refer to:
- Irish Republican Army (1919–1922), retronym "Old IRA" distinguishes it from later organisations using the name IRA
- National Association of Old IRA, made up of veterans of the IRA from the revolutionary period.
See also
- Irish Republican Army (disambiguation), other organisations of the name
- Traditional IRA, the original form of individual retirement arrangement (IRA) established in the United States by the Employee Retirement Income Security Act of 1974
- Ira (name), "old Ira" may be a pet name
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