Oak (disambiguation)
- Allocasuarina
- Allocasuarina decaisneana
- Arnold Schwarzenegger
- Casuarina
- Casuarina glauca
- Donar's Oak
- Fury from the Deep
- Grevillea robusta
- Grey oak
- Lagunaria
- List of Quercus species
- Lithocarpus
- Notholithocarpus
- OAK Racing
- Oak (band)
- Oak (flavoured milk)
- Oak (programming language)
- Oak (wine)
- Oak Creek (disambiguation)
- Oak Felder
- Oak Industries
- Oak Island (disambiguation)
- Oak Technology
- Oak Township, Stearns County, Minnesota
- Oak Tree (disambiguation)
- Oak Village
- Oak, Missouri
- Oak, Nebraska
- Oak, West Virginia
- Oakland Athletics
- Oakland International Airport
- Oakleigh railway station
- Oaks (disambiguation)
- P. N. Oak
- Professor Oak
- Quercus (disambiguation)
- Silky oak (disambiguation)
- The Oak
- Toxicodendron
- United Aircraft Building Corporation