| W 81.1 | Hawaii Department (1910-1920) |
| HE 1.801 | Head Start Bureau (1977) |
| HE 20.2501 | Health Care Facilities Service (1971-1973) |
| HE 20.6401 | Health Care Facilities Service (1973-?) |
| HE 20.2051 | Health Maintenance Organization Service (1972-?) |
| HE 20.6001 | Health Resources Administration (1973-1982) |
| HE 20.9001 | Health Resources and Services Administration (1982- ) |
| HE 20.5001 | Health Services Administration (1973-1982) |
| HE 20.2001 | Health Services and Mental Health Administration (1968- 1973) |
| I 70.1 | Heritage Conservation and Recreation Service (1978- 1981) |
| SI 13.1 | Hirshhorn Museum and Sculpture Garden (1974- ) |
| LC 24.1 | Hispanic Division (1940- ) |
| W 110.1 | Historical Division (1946-1947) |
| M 103.1 | Historical Division (1947-1949) |
| HE 20.9502 | HIV/AIDS Bureau (1997- ) |
| Y 1.2 | House of Representatives |
| Y 5.1/2 | House of Representatives |
| HH 3.1 | Housing Assistance Administration (1965-1969) |
| I 40.1 | Housing Authority (1937-1939) |
| FW 3.1 | Housing Authority (1939-1942) |
| L 8.1 | Housing Corporation (1918-1937) |
| A 111.1 | Human Nutrition Information Service (1981-?) |
| LC 2.1 | Humanities and Social Sciences Division |
| N 6.1 | Hydrographic Office (1866-1947) |
| M 202.1 | Hydrographic Office (1947-1949) |
