The Peace Pledge Union has its own archive and archivist. A description of collections held there can be found on the online presentation of the archive. Among the records held, it should be noted that many local branches of PPU have deposited their papers there (see online list). In addition to the local PPU archives, the online presentation mentions that "the Archive includes some published material from the No More War Movement, founded in 1921, which merged with the PPU in 1937, and other material illustrative of peace campaigning before and during the Second World War. There are files of material by and about significant individuals." There is also material about the Conscientious Objection movements in Britain and numerous photographs.

The archives of the PPU have been (at least partially) microfilmed by Harvester and can be found in libraries across the country (for example in the Bodleian library in Oxford). The full title of the microfilm is: "Pacifism, disarmament and international relations. Ser.3 , Archives of the Peace Pledge Union, parts one and two : a listing and guide to the Harvester Microfilm Collection", Brighton : Harvester Microform, 1988, xxxvii, 114 p. ; 21 cm.

It is made up of 2 parts: Part One: Annual Reports, 1937-1985 and Minute Books, 1936-1972 (10 reels); Part Two: The Pacifist, The PPU Journal, Pamphlets, Leaflets and other Publications, 1936-1986 (17 reels). An online online presentation of the collection can be found on the Publisher website.

Access to the Archive is by appointment only

Microfilm published by Harvester (see collection description)

Several local branches of the PPU have deposited their archive in local repositories, including:  Cambridge branch in Cambridge University Library, Department of Manuscripts and University Archives; Coventry branch (1941-1944, 1994: meetings minutes and historical notes) in Coventry Archives (ref. 1694, cat. NRA 20069 Coventry RO misc);  Sidcup group (Kent) in Centre for Kentish Studies (1937-38: minutes; ref. U2790, cat. NRA 3509 Kent AO misc).

There are also 6 boxes of papers relating to PPU in the Commonweal collection (which has been donated to Bradford University: JB Priestley Library) (see online catalogue).

The name of the Peace Pledge Union appears in over 25 catalogues in A2A. The papers of Max Plowman who from 1937 to 1938 was Secretary of the Peace Pledge Union have been deposited at University College London. It is possible that some papers relating to PPU are kept in this collection although it is not specified in the online catalogue). The same remarks apply to the papers of Constance Willis, a member of the Peace Pledge Union from the 1930s, held at Bradford University Library (ref. GB 532) (see online catalogue).