Index: Papers of John Adams, Volume 21, H
- Habersham, Joseph (U.S. postmaster general)
- Hagerstown, Md.
- Hague, The, Netherlands
- Haiti
- Haitian Revolution
- Half King (Wyandot chief)
- Halifax, Nova Scotia
- Hall, Joseph (Boston lawyer)
- Hall, Rev. Stephen (Castle William chaplain)
- Hall, Susanna Boylston Adams (1709–1797, mother of JA)
- Hall, Mr. (Brit. engraver)
- Hallam, Lewis, Jr. (Brit. actor)
- Hamburg, Germany
- Hamilton, Alexander
- Hammond, Abijah (N.Y. merchant)
- Hammond, George (Brit. minister to U.S.)
- Hammond, Margaret Allen (wife of George)
- Hampden, John (Brit. lawyer)
- Hampshire County, Mass.
- Hancock, John (Mass. politician)
- Hanover, Germany
- Hanson, Alexander Contee (Md. lawyer)
- Hapsburg, House of
- Hardenberg, Karl Augustus, Baron von (Prussian diplomat)
- Hardy, Thomas (Brit. political reformer)
- Harmar, Brig. Gen. Josiah (U.S.)
- Harnet, James (of the Maria)
- Harries, George (of Pembrokeshire, Wales)
- Harrington, James
- Harris & Blachford (Brit. mercantile firm)
- Harrisburg, Penn.
- Harrison, Capt. George (of the Tyger)
- Harrison, Richard (U.S. auditor)
- Hart, Oliver (Hopewell, N.J., pastor)
- Hartford, Conn.
- Hartley, David (Brit. peace negotiator)
- Hartley, Thomas (Penn. representative)
- Harvard, Mass.
- Harvard College
- Harvard Medical School
- Harvard University Press
- Harwich, England
- Hauteval, Lucien (St. Domingue planter)
- Havana, Cuba
- Hazard, Ebenezer (of Phila.)
- Hazard, Nathaniel (N.Y. merchant)
- Health and illnesses
- Hebrew language
- Hellevoetsluis, Netherlands
- Hempstead, N.Y.
- Henrico County, Va.
- Henry, John (Md. senator)
- Henry-Larivière, Pierre François Joachim (French revolutionary)
- Herkimer County, N.Y.
- Heth, William (Va. customs collector)
- Hewes, Josiah (Phila. merchant)
- Heysham, Robert (Senate clerk)
- Hichborn, Benjamin (Boston lawyer)
- Hiester, Daniel (Penn. representative)
- Higginson, Stephen (of Mass.)
- Hingham, Mass.
- Hisham ibn Mohammad (son of Mohammad III)
- Hispaniola
- History
- Hobby, Capt. John (of Reading, Mass.)
- Hoche, Gen. Louis Lazare (French)
- Holcroft, Thomas (Brit. political reformer)
- Holidays
- Holland (province of the Netherlands)
- Hollis, Thomas (Brit. antiquarian)
- Hollis, Thomas Brand (Brit. antiquarian)
- Hollis, Timothy (Brit. philanthropist)
- Holmes, Isaac (lt. gov. of S.C.)
- Homer
- Hondschoote, France
- Hood, Rear Adm. Samuel Hood, 1st Viscount (Brit.)
- Hope (Amer. brigantine)
- Hope (Brit. brig)
- Hopewell, N.J.
- Hopkins, John (M.P.)
- Hopkins, Lemuel (Hartford, Conn., physician)
- Horace
- Horne Tooke, John (Brit. political reformer)
- Horses
- Horton, Capt. (of the George)
- House of Representatives, U.S.
- Howard, Rev. Simeon (of Boston)
- Howe, Adm. Richard (1st lord of the admiralty)
- Howel, John (merchant in China)
- Hudson, Barzillai (Hartford, Conn., printer)
- Huger, Benjamin (of S.C.)
- Hughes, Arthur (Charleston, S.C., forage master)
- Hughes, John (son of Arthur)
- Hull, James (Amer. sailor)
- Hull, Mass.
- Hume, David (Scottish philosopher)
- Humphreys, Col. David (U.S. diplomat)
- Humphreys, George (of Sparkbrook, England)
- Humphreys family
- Hunter, Banks, & Company (Brit. mercantile firm)
- Huntington, Benjamin (Conn. representative)
- Huntington, Samuel (gov. of Conn.)
- Huron Nation
- Hutchins, Thomas (cartographer)
- Hutchinson, Dr. James (Penn. physician)
- Hutchinson, Thomas (former gov. of Mass.)
- Hyde, The (Brit. estate)