This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Aitchison baronets" – news · newspapers · books · scholar · JSTOR (March 2016) (Learn how and when to remove this message)

The Aitchison Baronetcy, of Lemmington in the county of Northumberland, is a title in the Baronetage of the United Kingdom.^[1] It was created on 31 January 1938 for Sir Stephen Aitchison, of Lemmington Hall, Northumberland, a Justice of the Peace for the city and county of Newcastle upon Tyne and for Northumberland.

• Sir Stephen Aitchison, 1st Baronet (1863–1942)
• Sir Walter de Lancy Aitchison, 2nd Baronet (1892–1953)
• Sir Stephen Charles de Lancy Aitchison, 3rd Baronet (1923–1958)
• Sir Charles Walter de Lancy Aitchison, 4th Baronet (born 1951)

The heir apparent is Rory Edward de Lancey Aitchison (born 1986)

• Kidd, Charles, Williamson, David (editors). Debrett's Peerage and Baronetage (1990 edition). New York: St Martin's Press, 1990, ^{[page needed]}
• Leigh Rayment's list of baronets