Iona McDonald

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| honorific_suffix = OBE

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| office = Lord Lieutenant of Ayrshire and Arran

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| term_start = 26 October 2017

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Charles III

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| deputy = John Dalrymple Hamilton

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| predecessor = John Lawrence Duncan

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| birth_name = Iona Sara Macintyre McDonald

| birth_date = {{Birth date and age|1954|11|18}}

| birth_place = Ayrshire, Scotland

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| education = Cumnock Academy

| alma_mater = University of Glasgow

| occupation = Sheriff, solicitor

| profession = Sheriff and solicitor within Scots law

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Iona Sara Macintyre McDonald OBE{{cite web|url=https://www.scotcourts.gov.uk/about-the-scottish-court-service/scs-news/2019/06/21/obe-for-sheriff-mcdonald|title=OBE for Sheriff McDonald: 21 June 2019|website=Scottish Court Service}} (born 18 November 1954) is a Scottish sheriff who was appointed as a temporary Sheriff in 1994 before receiving a full appointment in 2000 to the Sheriffdom of North Strathclyde, sitting in both the Paisley and Kilmarnock Sheriff courts. Since 2007, she has been Senior Sheriff at Kilmarnock and has served as the Lord Lieutenant of Ayrshire and Arran since 2017.{{cite web|url=https://www.gov.uk/government/news/lord-lieutenant-for-ayrshire-and-arran-26-october-2017|title=Lord-Lieutenant for Ayrshire and Arran: 26 October 2017|website=GOV.UK}}{{cite web |title=Lord-Lieutenant and Vice Lord-Lieutenant |url=https://www.lordlieutenantayrshireandarran.org.uk/lord_lieutenant_and_vice_lord_lieutenant |website=www.lordlieutenantayrshireandarran.org.uk |access-date=29 January 2025}}

McDonald was educated at Cumnock Academy and graduated from Glasgow University with a Master of Arts in 1976 and a law degree in 1978.{{Who's Who | title=McDonald, Bill | id = U289464 | volume = 2018 | edition = February 2018 online | access-date = 13 February 2018 }} She is a solicitor, and previously worked for the Ayr firm Mathie-Morton, Black and Buchanan, where she became partner in 1982. She was appointed as a temporary sheriff in 1994, was the sheriff of North Strathclyde from 2000 to 2007; and senior sheriff of Kilmarnock since then.{{cite web|url=http://www.ardrossanherald.com/news/15662603.kilmarnock-sheriff-appointed-lord-lieutenant/|title=Kilmarnock Sheriff appointed Lord Lieutenant|website=Ardrossan and Saltcoats Herald}}{{cite web|url=https://www.lordlieutenantayrshireandarran.org.uk/article/appointment_of_lord_lieutenant_thursday_26th_october_2017|title=News - Appointment of Lord-Lieutenant – Thursday 26th October 2017 - Reactec|website=www.lordlieutenantayrshireandarran.org.uk}} She was appointed Officer of the Order of the British Empire (OBE) for services to law and order in the Queen's Birthday Honours' List 2019.{{fact|date=February 2020}}