John Satterfield Sandars, CVO, PC (15 January 1853 – 29 March 1934) was a British barrister who served as Private Secretary to Arthur Balfour, Prime Minister of the United Kingdom.

[1] Three years later, in 1895, he became the private secretary to Arthur Balfour, then Leader of the House of Commons and First Lord of the Treasury.

Sandars was sworn of the Privy Council[2] and appointed CVO in the 1905 Prime Minister's Resignation Honours.

[3] He married Harriette Grace Mary, daughter of Sir William Don on 10 August 1892.

John Sandars died at home at Eastley End House near Thorpe, Surrey on 29 March 1934 at the age of 80.