1. See also

Penal may refer to:

• Penal colony
• Penal system, prisons
• Penal military unit
• Penal (town), Trinidad and Tobago

See also

• Penale, surname
• Penile, to do with the penis

• Quercus nudinervis
• Quercus oajacana
• Quercus oblongata
• Quercus obovalifolia
• Quercus obovata
• Quercus obovatifolia
• Quercus obtusa
• Quercus obtusata
• Quercus obtusifolia
• Quercus obtusiloba
• Quercus occidentalis
• Quercus ochracea
• Quercus ochroesthes
• Quercus oerstediana
• Quercus oligodes
• Quercus olivaeformis
• Quercus oliviformis
• Quercus omalokos
• Quercus oocarpa
• Quercus oophora
• Quercus ophiosquamata
• Quercus orbiculata
• Quercus orizabae
• Quercus ostryifolia
• Quercus ovalifolia