Sir John Audley Frederick Aspinall (25 August 1851 – 19 January 1937) was an English mechanical engineer who served as Locomotive Superintendent of the Great Southern and Western Railway (GS&WR) of Ireland and Lancashire and Yorkshire Railway (L&YR) of England.

[1][2] He attended the Roman Catholic boarding school of Beaumont College, Berkshire before being apprenticed to engineers John Ramsbottom and Francis Webb of the London and North Western Railway in 1868.

[1] In 1875, he moved to the Great Southern and Western Railway of Ireland and became their works manager at Inchicore, Dublin.

[1] Aspinall served as president of the Institution of Mechanical Engineers between 1909 and 1910 and was interned in Germany at the outbreak of the First World War in 1914.

[1] Aspinall received a knighthood on 13 June 1917 for his contributions to the war effort and national transport system.