Rear-Admiral Sir Charles Langdale Ottley KCMG CB MVO (8 February 1858 – 24 September 1932) was a Royal Navy officer who served as Director of Naval Intelligence.

[2] Ottley was the main naval delegate to the Second Hague Conference in 1907 and took a leading role in drafting the convention limiting the employment of submarine mines.

[2] The next year at the International Maritime Conference he accepted limits on the use of economic blockade, a considerable concession as Britain was at the time the world's greatest naval power.

[2] According to the naval historian Andrew Lambert: He was a man of much charm and no little literary ability, a good linguist, and a fluent, convincing, and persuasive speaker.

He made the committee of imperial defence a highly effective secretariat and co-ordinating body, but never achieved the influence or eminence of his successor.