Rear Admiral Sir Adolphus Augustus Frederick FitzGeorge KCVO (30 January 1846 – 17 December 1922) was a senior officer of the Royal Navy.

As the marriage was void, he and his brothers, George and Augustus, were illegitimate and therefore did not hold royal titles and were ineligible to succeed to the Dukedom of Cambridge.

In June 1867, he joined the Galatea, screw frigate, commanded by Captain the Duke of Edinburgh, and in March 1872, was appointed Flag Lieutenant to Admiral Sir Rodney Mundy, Commander-in-Chief, Portsmouth.

Following a period at the Royal Naval College, he became Inspecting Officer of Coastguard at Scarborough in February 1874, and in September of the next year, was given command of the sloop Rapid in the Mediterranean.

In March 1885, he became captain of the troopship Jumna, in the transport service to India, and his two years or more in this command marked the limit of his active naval employment.