Sir Charles Frederick (c. 1709-1785), Surveyor-General of the Ordnance, and one of the two trustees in whose names the Isle of Man was bought for the Crown.

The Revestment was carried through by way of a trust. Viscount Stormont, with the privity and approbation of James, Duke of Atholl, nominated Frederick and Edmund Hoskins of Lincoln's Inn to fill the places of Archibald, Duke of Argyll, and John Sharpe, both of whom had died. By a deed poll of 8 July 1762 John Wood, Governor and Commander in Chief of the Island, re-enfeoffed the Isle to Stormont, Frederick and Hoskins as trustees. The contract with the Commissioners of the Treasury of 7 March 1765 was made between four of the Commissioners on the one part and the Duke and Duchess of Atholl with Frederick and Hoskins their trustees on the other, for the absolute purchase of the Island with its dependencies. It provided that on payment by the King into the Bank of England of seventy thousand pounds, in the names of the Duke and Duchess, Sir Charles Frederick and Edmund Hoskins, or the survivors of them, free and clear of all taxes, impositions, fees and other deductions, the Isle of Man should vest unalienably in the Crown, and that the cashier's receipt should be a sufficient discharge to His Majesty.

He sat for Queenborough, and the parliamentary lists give him as surveyor-general of the ordnance and comptroller of the laboratory at Woolwich. He was made a Knight of the Bath in 1761, and was succeeded in the surveyor-generalship by Mr Pelham.

He answered for the Ordnance in the Commons during the American war. Pressed in 1778 on why so much artillery had been sent and so many men with it, he explained that sending the artillery companies out in three separate bodies to serve under as many generals in different places had cost twice what it would have done had they served as one corps. In the debate on the defence of Plymouth he maintained, against members who said the place would have surrendered without firing a gun, that there were at least seventy rounds of powder on the island of St Nicholas, and that a carpenter could have made up the small stores in a quarter of an hour.