Barony of Kilmarnock
Creation date	1831
Created by	King William IV
Peerage	Peerage of the United Kingdom
First holder	William Hay, 1st Baron Kilmarnock
Present holder	Robin Boyd, 8th Baron Kilmarnock
Heir apparent	Simon John Boyd
Remainder to	heirs male of the body of the grantee

Baron Kilmarnock, of Kilmarnock in the County of Ayr, Scotland, is a title in the Peerage of the United Kingdom. It was created in 1831 for William Hay, 18th Earl of Erroll. This was a revival of the Kilmarnock title held by his great-grandfather William Boyd, 4th Earl of Kilmarnock, who was attainted in 1746 (with his titles forfeited). The barony of Kilmarnock remained a subsidiary title of the earldom of Erroll until the death in 1941 of the eighteenth Earl's great-great-grandson, the twenty-second Earl. The earldom, which could be passed on through female lines, was inherited by the late Earl's daughter and only child, the twenty-third Countess. The barony of Kilmarnock, which could only be passed on to male heirs, was inherited by the Earl's younger brother, the sixth Baron. He assumed the surname of Boyd in lieu of Hay the same year he succeeded to the title. As of 2013^[update] the title is held by his younger son, the eighth Baron, who succeeded his elder brother in 2009.

The current Barons Kilmarnock are the hereditary Clan Chiefs of Clan Boyd.

• 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), brother of the 22nd Earl of Erroll
• Alastair Ivor Gilbert Boyd, 7th Baron Kilmarnock (1927–2009), son of the 6th Baron
• Robin Jordan Boyd, 8th Baron Kilmarnock (1941–), brother of the 7th Baron

The heir presumptive is the holder's son Hon. Simon John Boyd (b. 1978).

• Clan Boyd
• Earl of Erroll
• Earl of Kilmarnock

• Kidd, Charles (1903). Debrett's peerage, baronetage, knightage, and companionage. London: Dean & Son. p. 364.
• Hesilrige, Arthur G. M. (1921). Debrett's Peerage and Titles of courtesy. London: Dean & Son. p. 351.

v t e Extant hereditary baronies in the Peerage of the United Kingdom
King George III	Ellenborough Manners
The Prince Regent	Churchill Harris
King George IV	Ravensworth Delamere Forester Rayleigh Gifford Feversham Seaford Plunket Heytesbury Skelmersdale Wynford
King William IV	Kilmarnock Poltimore Mostyn de Saumarez Denman Abinger Ashburton Hatherton Stratheden Lovat^*
Queen Victoria	Rossmore^• Carew^• de Mauley Wrottesley Sudeley Methuen Stanley of Alderley^• Leigh Monteagle of Brandon Campbell Vivian Congleton Eddisbury^• Londesborough de Freyne Raglan Belper Chesham Churston Leconfield Lyveden Brougham and Vaux Westbury Annaly Northbrook Hartismere^• Hylton Penrhyn O'Neill Napier of Magdala Dunning^* Acton Wolverton O'Hagan Sandhurst Ettrick^* Aberdare Moncreiff Coleridge Cottesloe Hampton Harlech Tollemache Gerard Sackville Norton Trevor Ampthill Derwent Hothfield Tennyson Strathspey Monk Bretton Northbourne Northington^• Rothschild Revelstoke Monkswell Ashbourne St Oswald Montagu of Beaulieu Elphinstone^* Hindlip Grimthorpe Kensington^• Hamilton of Dalzell St Levan Basing de Ramsey Addington Savile Ashcombe Crawshaw Amherst of Hackney Newton Dunleath Swansea Aldenham HolmPatrick Burton Glanusk Cranworth Avebury Killanin Strathcona and Mount Royal
King Edward VII	Kinross Shuttleworth Grenfell Redesdale Burnham Biddulph Ritchie of Dundee Hemphill Joicey Nunburnholme Swaythling Blyth Marchamley Gorell Fisher Kilbracken
King George V	Hardinge of Penshurst de Villiers Glenconner Aberconway Merthyr Rowallan Ashton of Hyde Ravensdale Hollenden Parmoor Cunliffe Wrenbury Faringdon Shaughnessy Rathcreedan Somerleyton Carnock Beaverbrook Gainford Forteviot Colwyn Gisborough Morris Cawley Terrington Glenarthur Phillimore Inverforth Sinha Cochrane of Cults Clwyd Russell of Liverpool Swinfen Meston Cullen of Ashbourne Trevethin Glendyne Manton Forres Vestey Borwick Maclay Bethell Hunsdon Darling Banbury of Southam Merrivale Bradbury Mereworth^• Greenway Hayter Cornwallis Daresbury Wraxall Remnant Moynihan Craigmyle Dulverton Luke Alvingham Baden-Powell Ponsonby of Shulbrede Dickinson Noel-Buxton Howard of Penrith Rochester Selsdon Moyne Davies Rankeillour Brocket Milne Rennell Mottistone Iliffe Palmer Rockley Elton Wakehurst Hesketh Tweedsmuir Wigram Riverdale May Kennet Strathcarron
King Edward VIII	Catto
King George VI	Windlesham Mancroft McGowan Denham Rea Cadman Kenilworth Pender Roborough Brassey of Apethorpe Stamp Bicester Milford Hankey Harmsworth Rotherwick Glentoran Tryon Croft Teviot Nathan Reith Kindersley Ironside Latham Wedgwood Geddes Bruntisfield Brabazon of Tara Keyes Hemingford Moran Killearn Dowding Gretton Westwood Hazlerigg Hacking Chetwode Sandford Altrincham Broadbridge Mountevans Lindsay of Birker Piercy Chorley Calverley Tedder Colgrain Darwen Lucas of Chilworth Shepherd Newall Oaksey Rugby Layton Simon of Wythenshawe Kershaw Trefgarne Crook Amwell Milverton Clydesmuir Burden Haden-Guest Silkin§ Hives Ogmore Morris of Kenwood Macpherson of Drumochter Kenswood Freyberg Milner of Leeds Kirkwood Wise
Queen Elizabeth II	Jeffreys Rathcavan Baillieu Grantchester Coleraine Harvey of Tasburgh Gridley Strathalmond Strathclyde Clitheroe McNair Colyton Astor of Hever Sinclair of Cleeve Bridges Norrie Birkett Harding of Petherton Poole Rootes Netherthorpe Crathorne Spens MacAndrew Nelson of Stafford Howick of Glendale Sanderson of Ayot Cobbold Robertson of Oakridge Marks of Broughton Fairhaven Leighton of St Mellons Brain Aldington Inchyra Silsoe Egremont Thomson of Fleet Martonmere Sherfield Inglewood Glendevon Grimston of Westbury Renwick St Helens Margadale
§: Disclaimed.  Italics: This title is held by a peer who holds another of higher precedence. ^* Also a Lord in the Peerage of Scotland  ^• Also a Baron in the Peerage of Ireland