Henry John "Harry" Cockayne-Cust, MP, JP, DL (10 October 1861 – 2 March 1917) was an English politician and editor who served as a Member of Parliament (MP) for the Unionist Party.
Cust was born to Sara Jane Cookson and Henry Cockayne-Cust, and was educated at Eton (where he was captain of the Oppidans) and Trinity College, Cambridge. While at Trinity, he was elected to the Apostles and graduated with second-class honours in the Classical Tripos with a Bachelor of Arts (B.A.). Initially pursuing a legal career, Cust was admitted to the Inner Temple in 1888 but was not called. Instead he decided to enter Parliament, and won a by-election in 1890 for Stamford, Lincolnshire. He left Parliament at the general election of 1895, but returned five years later in 1900 when he won a seat in the constituency of Bermondsey, remaining until 1906. Meanwhile, he served as Justice of the Peace (J.P.) for Bedfordshire and as Deputy Lieutenant (D.L.) of Bedfordshire, as well as Justice of the Peace (J.P.) for Lincolnshire.
Henry Francis Cockayne-Cust (15 September 1819 – 5 April 1884), was a British Conservative Party politician.
Born Henry Cust, Cockayne-Cust was the eldest son of Reverend the Hon. Henry Cust, Canon of Windsor, younger son of Brownlow Cust, 1st Baron Brownlow. His mother was Lady Anna Maria Elizabeth, daughter of Francis Needham, 1st Earl of Kilmorey. He later assumed the additional surname of Cockayne by Royal license.
Cockayne-Cust was a Captain in the 8th Hussars and a Major in the Shropshire Yeomanry. In 1874 he entered Parliament as one of two representatives for Grantham, a seat he held until 1880.
Cockayne-Cust married Sara Jane, daughter of Isaac Cookson and widow of Sidney Robert Streatfield, in 1852. They had two sons and four daughters. Their eldest son was Henry Cust. Sarah Jane died in childbirth in September 1867. Cockayne-Cust remained a widower until his death in April 1884, aged 64. His youngest son Adelbert succeeded as fifth Baron Brownlow in 1921.