Oncidium Sw.
Oncidium weltonii
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Oncidium Wendlandianum
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Oncidium Wendy Wadsworth
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Oncidium wentworthianum
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Oncidium Werribee
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Oncidium Wessex
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Oncidium West Park
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Oncidium Western District
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Oncidium Westhaven
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Oncidium Westmount
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Oncidium Westpoint Beauty
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Oncidium Wetherby
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Oncidium Wey
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Oncidium White Caps
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Oncidium White Heron
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Oncidium White Knight
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Oncidium White Night
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Oncidium White Rock
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Oncidium White Tiger (1975)
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Oncidium White Tiger (1993)
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Oncidium Whitehead
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Oncidium Whiterock
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Oncidium Whitewood
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Oncidium Wickhamensis