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- Adán de Yarza, Mariano
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- Adapted Nurseries, Carmen Grape Company.
- Adapted Nurseries.
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- Addition Nursery Co.
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- Adelaide Botanic Garden.
- Adelaide Botanic Gardens.
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- Adkins, William Ryland Dent, Sir, 1862-1925
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- Adlard, Alfred,
- Adlard, Henry,
- Adlard, James Evan,
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- Adolf Johanson (Firm)
- Adolf, Mühl
- Adolph Fischer (Firm)
- Adolph Fischer Nurseries.
- Adolph, Clement
- Adolph, Edward F. (Edward Frederick), 1895-1986
- Adolph, Helen M.
- Adolphe, Jean-Pierre
- Adolphus Wysong (Firm)
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- Adorian, Gentil Cavalheiro
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- Adrian J. Schoorl (Firm)
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- Adrian Van Leeuwen, Jr. (Firm)
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- Adrián, Rosales-Casián Jorge
- Adriano, Lourdes
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- Adu-Acheampong, Richard
- Adula, Motuma
- Adum, Gilbert Baase
- Adunanza Degli Scienziati Italiani Naples, Italy) 1845-