Sir Herbert Samuel Leon, 1st Baronet was an English financier and Liberal Party politician, now best known as the main figure in the development of the Bletchley Park estate in Buckinghamshire.

Bletchley Park is an English country house and estate in Bletchley, Milton Keynes (Buckinghamshire), that became the principal centre of Allied code-breaking during the Second World War. The mansion was constructed during the years following 1883 for the financier and politician Herbert Leon in the Victorian Gothic, Tudor and Dutch Baroque styles, on the site of older buildings of the same name.