Discocactus petr-halfarii

{{Short description|Species of cactus}}

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| taxon = Discocactus petr-halfarii

| authority = Zachar

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Discocactus petr-halfarii is a species of Discocactus found in Brazil.{{cite web | title=Discocactus petr-halfarii Zachar | website=Plants of the World Online | url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77090752-1 | access-date=2024-01-02}}