Jellicoe was placed on the Retired List on 5 December, 1924.
In November, 1928, Jellicoe was elected to a seat on the Board of Directors of the Midland Bank. In early 1930 he was appointed to the London Board of the Australian Mutual Provident Society in the place of the late Sir George A. Cockburn.
Royal British Legion
Jellicoe was compelled by illness to stand down as president of the British Legion in 1932. He wrote to the Legion's chairman, Colonel John Brown:
- The doctors have convinced me that I shall never be fit for the work of president again. I regret exceedingly having to write to you to inform you of this, but all the doctors who have attended me tell me that I must of necessity give up the work, as I cannot possibly be fit to carry it out. Will you, therefore, take this letter as my official resignation after Whitsun. I need hardly say that I do not wish to drop the Legion work, and that I am ready to do what I can.
- London Gazette: no. 33001. p. 9072. 12 December, 1924.
- "Lord Jellicoe's Bank Directorship" (Business Appointments). The Times. Friday, 23 November, 1928. Issue 45058, col C, p. 24.
- The Economist. Saturday, 1 February, 1930. Issue 4510, p. 278.
- "Lord Jellicoe and the British Legion" (News). The Times. Saturday, 9 january, 1932. Issue 46026, col G, p. 3.