The centre-half joins the Bluebells having played for Toolstation Western League side Cadbury Heath last season.
Macmillan signed for the Heath in September 2020 after spells at Longwell Green, Roman Glass St George and Chipping Sodbury Town.
Yate manager John Rendall told his club’s website: "Ewan impressed last season and many clubs wanted him to sign this summer, so I am pleased he’s decided we are best to further aid his own development".
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