Barons Kilmarnock (1831)
- William George Hay, 18th Earl of Erroll, 1st Baron Kilmarnock (1801–1846)
- William Harry Hay, 19th Earl of Erroll, 2nd Baron Kilmarnock (1823–1891)
- Charles Gore Hay, 20th Earl of Erroll, 3rd Baron Kilmarnock (1852–1927)
- Victor Alexander Sereld Hay, 21st Earl of Erroll, 4th Baron Kilmarnock (1876–1928)
- Josslyn Victor Hay, 22nd Earl of Erroll, 5th Baron Kilmarnock (1901–1941)
- Gilbert Allan Rowland Boyd, 6th Baron Kilmarnock (1903–1975)
- Alastair Ivor Gilbert Boyd, 7th Baron Kilmarnock (1927–2009)
- Robin Jordan Boyd, 8th Baron Kilmarnock (b. 1941)
The heir apparent is the present holder's eldest son, Simon John Boyd (b. 1978)
The heir apparent's heir apparent is his son Lucian Michael Boyd (b. 2007).
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“We live by our imaginations, by our admirations, by our sentiments. The child walks amid heaps of illusions, which he does not like to have disturbed. The boy, how sweet to him his fancy! how dear the story of barons and battles! What a hero he is, whilst he feeds on his heroes! What a debt is his to imaginative books!”
—Ralph Waldo Emerson (1803–1882)