Sir Edmund Henry Knowles Lacon, 3rd Baronet (14 August 1807 – 2 December 1888) was an English businessman and liberal Conservative politician who sat in the House of Commons in two periods between 1852 and 1885.

Lacon was the son of Sir Edmund Knowles Lacon, 2nd Baronet, and his wife Eliza Beecroft, daughter of Thomas Beecroft of Saxthorpe Hall.

[4] He was also Chairman of the Great Yarmouth & Stalham Light Railway[5] which later became part of the Midland & Great Northern Joint Railway.

He was appointed Lieutenant Colonel commanding the East Norfolk Militia on 16 March 1860 and of the 1st Norfolk Administrative Battalion of Artillery Volunteers on 2 December 1864.

[2][3] On 23 March 1839 Lacon married Eliza Georgiana Hammet (d. 31 March 1881), daughter of James Esdaile Hammet of Battersea, and they had six children:[3] Lacon died at the age of 81.