Name
- Griffith, Robert, correspondent of Edward Southwell, fl 17231
- Gustavus Adolphus II, King of Sweden1
- Guzman, Anielo, correspondent of Sir Robert Southwell, fl 16701
- HM Customs and Excise, 1909-20051
- Habsburg, Ferdinand II, Emperor of Germany, 1578-16371
- Hamilton, James, 6th Earl of Abercorn1
- Hanaper Office1
- Handasyde, Thomas, Colonel1
- Harbord, William, Ambassador to the Hague1
- Haren, Willem, Dutch poet and politician1
- Harley, Robert, politician, 1579-16561
- Haro y Gusman, Gaspar, Marques de Carpio y Eliche, Conde Duque de Olivares1
- Harod de Senevas, Melchior, Marquis de St. Romain1
- Hastings, James1
- Hawley, Henry, Colonel; MP for Kinsale1
- Heber, Richard, book collector, 1773-18331
- Heber, Richard, of Add MS 343241
- Hedges, Charles, of Add MS 343531
- Heinsius, Anthonie, Grand Pensionary of Holland1
- Herbert, Charles, son of Philip, 4th Earl of Pembroke1