The collection held at Churchill Archives Centre includes: official and family correspondence; correspondence about Fisher and his biography collected by Nina, Duchess of Hamilton; papers on naval subjects; material relating to the Oil Commission; material relating to the Board of Invention and Research; printed material: Admiralty, Committee of Imperial Defence, Cabinet and White Papers; material intended for Fisher's printed works, personal notes, papers and albums; letters to newspapers, printed proofs and printed works; press cuttings; photographs; miscellaneous material; material collected by 2nd Lord Fisher about his father; letters from Fisher to George Lambert and material collected by Lambert as Fisher's literary executor.

The collection has close connections with the career of Sir Winston Churchill and includes personal correspondence and official papers involving Sir Winston. There are numerous papers relating to the disastrous Dardanelles Campaign over which Fisher resigned as 1st Sea Lord. There are also fascinating papers illustrating advances in gunnery and torpedoes for which Fisher was largely responsible in the 1880s, and important material relating to his development after 1900 of a reformed system of officer selection and training and his involvement in the design of the Dreadnought class of battleship.