William Graham Nicholson, PC, JP (11 March 1862 – 29 July 1942)[1] was a British Liberal Unionist and later Conservative Party politician.

[2] He grew up in Basing Park at Froxfield, which later became his seat.

[3] He was educated at Harrow School and at Trinity College, Cambridge.

[4] Nicholson served as Director-General on Mobilisation in the Second Anglo-Boer War from 30 June 1901 and was promoted an Honorary Colonel commanding the 3rd Battalion of the Hampshire Regiment.

[5] After the death of the Conservative MP William Wickham, he was elected at a by-election in June 1897 as the Liberal Unionist Member of Parliament (MP) for Petersfield in Hampshire,[6] a seat which had previously been held by his father.