The Workman-Macnaghten, later Macnaghten Baronetcy, of Bushmills House in the County of Antrim, is a title in the Baronetage of the United Kingdom. It was created on 16 July 1836 for Francis Workman-Macnaghten, a Judge of the Supreme Court of Madras between 1809 and 1815 and of Calcutta between 1815 and 1825. Born Francis Macnaghten, he assumed the additional surname of Workman in 1809. The fourth Baronet discontinued the use of the surname Workman. In 1887 he was created a Lord of Appeal in Ordinary as Baron Macnaghten, of Runkerry in the County of Antrim. Both the sixth and seventh Baronets were killed in the First World War. Also William Hay Macnaghten was created a Baronet on 1840, but the Baronetcy became extinct upon his murder.
Ernest Macnaghten (1872–1948), grandson of Elliot Macnaghten, fourth son of the first Baronet, was a Brigadier-General in the British Army and Chairman of the Shanghai Municipal Council.
The Macnaghten family is of great antiquity in the Western Highlands. The present Baronet is Chief of Clan Macnaghten.
The family seat was Dundarave House, near Bushmills, Antrim, Northern Ireland.
The heir presumptive is the present holder's brother Edward Alexander Macnaghten (born 1958).