| A Diaries, 1914-21 |
| B National insurance and early medical papers, 1832-1933 |
| B1 Public health provision and poor law relief, 1832-1929 |
| B2 National Insurance provision, 1910-33, and (c. 16) miscellaneous papers, 1907-16 |
| C Board of Education (Aug. 1914-May 1915), 1910-22 |
| C1 Letters of congratulation and papers relating to children and child welfare, 1910-17 |
| C2 Council for Scientific and Industrial Research, 1915-22, and (c. 21) papers relating to further and medical education, 1910-22 |
| D Ministry of Munitions (May 1915-July 1917), 1899-1935 |
| D1 Papers concerning establishment and running of the Ministry |
| D2 Papers concerning supply and manufacture, including Departmental papers |
| D3 Papers concerning employees |
| E Ministry of Reconstruction (July 1917-Jan. 1919), 1915-38 |
| E1 Official papers, 1916-20 |
| E2 Official correspondence, 1916-20 |
| E3 Post War Priority Council, 1918, and (c. 113-15) supply of raw materials, 1917-38 |
| E4 Industrial relations and demobilisation, 1915-22 |
| E5 Land settlement, agriculture, and housing, 1916-19 |
| E6 Transport, 1917-19, (c. 122-3) trade relations, 1917-23, and (c. 124) miscellaneous papers, 1916-18 |
| F Local Government Board (Jan.-June 1919), 1917-20 |
| G Ministry of Health (June 1919-Apr. 1921), 1890-1951 |
| G1 Ministry of Health administration, staff, and legislation |
| G2 Ministry of Health papers on health issues |
| G3 Ministry of Health papers on housing issues |
| H Minister without Portfolio (Apr.-July 1921), 1921-8 |
| I Ministry of Agriculture and Fisheries (1929-31), 1905-51 |
| I1 Official papers, 1928-39 and (c. 165) agricultural legislation, 1929-38 |
| I2 Marketing commodities and marketing legislation, 1929-35, and (c. 169-72) specific crops, 1919-38, including (c. 173-4, d. 8/1) the Egg and Poultry Reorganisation Committee, 1929-38 |
| I3 Labour Party policy on agriculture, 1920-51 |
| I4 National Parks, 1929-39, and (c. 180-2) miscellaneous papers, 1905-39 |
| J House of Lords (May 1937-Dec. 1951), 1918-51 |
| K Party and Constituency Papers, 1910-48 |
| K1 Hoxton (later Shoreditch), 1910-48, and (c. 198-201) Swindon, 1920-36 |
| K2 Coalition Government, 1919-22 |
| K3 Labour Party, 1923-45 |
| K4 Committees on which Addison served, 1930-9 |
| L Miscellaneous political and personal correspondence, 1906-51 |
| M Speeches, 1916-33 |
| N Papers relating to Addison's publications, 1914-39 |
| O Press cuttings, 1909-50 |
| P Photographs and original cartoons, 1880-1948 |
| Q Personal and family papers, 1883-1980 |
| Q1 Early family papers, and papers of Isobel Addison, 1895-1952 |
| Q2 Papers of Dorothy Addison, 1925-80 |
| Q3 Papers relating to Addison's homes and property, 1901-32 |
| Q4 Papers relating to Addison's business ventures, 1930-51 |
| Q5 Miscellaneous personal papers, 1883-1960, and (c. 248) papers relating mainly to Addison's death and biography, 1935-77 |
| R Papers, mainly of Dorothy, Lady Addison, relating to Christopher Addison, 1895-1960 |