William McDowall (c. 1749 – 3 April 1810) of Garthland and Castle Semple was a Scottish Member of Parliament.
[1] He was the eldest son of William McDowall, Member of Parliament for Renfrewshire from 1768 to 1774, and Elizabeth Graham.
[1] He owned property in Grenada and St Kitts as well as extensive lands in west-central Scotland which he bequeathed in trust to his nephew William McDowall (1770-1840), son of his brother James.
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