Blue Oak (Quercus douglasii) is a species of oak native to California.

Blue Oak may also refer to:

• Blue Oak School, a private elementary school in Napa, California
• Blue Oak Ranch Reserve, part of the University of California Natural Reserve System
• Blue Oak Energy, a photovoltaic energy company
• Blue Oak, a character from Pokémon

This disambiguation page lists articles associated with the title Blue Oak.
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