Houssay may refer to:

• Bernardo Houssay (1887–1971), Argentine physiologist and Nobel Prize winner
• Houssay, Loir-et-Cher, a commune in the Loir-et-Cher department, France
• Houssay, Mayenne, a commune in the Mayenne department, France

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• Oeceoclades alismatophylla
• Oeceoclades ambongensis
• Oeceoclades ambrensis
• Oeceoclades analamerensis
• Oeceoclades analavelensis
• Oeceoclades angustifolia
• Oeceoclades atrovirens
• Oeceoclades boinensis
• Oeceoclades calcarata
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• Oeceoclades flavescens
• Oeceoclades furcata
• Oeceoclades gracillima
• Oeceoclades hebdingiana
• Oeceoclades humbertii
• Oeceoclades lanceata