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- Hopwood, S F
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- Hora, Regis Catarino da
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- Hora, Sunder Lal, 1896-1955
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- Horace W. Mann (Firm)
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- Horn Canna Farm,
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- Horn Scientific Exploring Expedition, 1894.
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- Hornberger's Service.
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- Hornell Nursery Co.
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- Horner, William Edmonds, 1793-1854
- Hornero del Castillo, Javier
- Horner'S Nursery,
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- Hornidy, O. Evans.
- Hornig, C Evan
- Hornig, Emil
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- Horniman Museum
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- Horning, D S
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- Hornsby, Peter
- Hörnschemeyer, Thomas
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- Hornung, Elizabeth
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- Hornung, Leonhard Friedrich.
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