Ewen MacLachlan (Gaelic: Eoghan MacLachlainn) (1775–1822) was a Scottish scholar and poet. He is noted for his translations of ancient classical literature into Gaelic, for his own Gaelic verse, and for his contribution to Gaelic dictionaries.
MacLachlan is considered one of the most important figures in the preservation of Gaelic as a written language and written literature.
MacLachlan was born in Lochaber, and educated at Aberdeen University. He was librarian to University and Kings College, Aberdeen from 1800–1818, and headmaster of Aberdeen grammar school from 1810–1822. He translated the first eight books of Homer's Iliad into Gaelic. He also composed and published his own Gaelic Attempts in Verse (1807) and Metrical Effusions (1816), and contributed greatly to the 1828 Gaelic–English Dictionary.
- Anderson, Peter John. Ewen MacLachlan: Librarian to University and Kings College, Aberdeen, 1800-1818. Aberdeen: University Press, 1918.
- Some sources give 1773 as MacLachlan's birth year.
- "Maclachlan, Ewen". Dictionary of National Biography. London: Smith, Elder & Co. 1885–1900.
- Ewen MacLachlan's works on GoogleBooks
- Ewen MacLachlan in Celtic Culture: A Historical Encyclopedia
- Ewen MacLachlan in The Poets and Poetry of Scotland
- Ewen MacLachlan in Sar-obair nam Bard Gaelach, or The Beauties of Gaelic Poetry and Lives of the Highland Bards