Oak leaf or Oakleaf may refer to:
Biology
the leaf of an oak
oak leaf lettuce, from the Lactuca sativa group
Any member of the butterfly genus Kallima
The species Kallima knyvetti
Military
Oak leaf cluster, a U.S. military decoration
A bronze oak leaf device, used to signify a Mention in Despatches in Commonwealth militaries
A silver oak leaf device, used to signify the award of the King's Commendation for Valuable Service in Commonwealth militaries
Oak leaves awarded to holders of some categories of the German Iron Cross and the Knight's Cross of the Iron Cross
Golden oak leaf, insignia of rank of Major (United States)
Golden oak leaf, insignia of rank of Lieutenant commander (United States)
Silver oak leaf, insignia of rank of Commander (United States)
Silver oak leaf, insignia of rank of Lieutenant colonel (United States)
Golden oak leaf, insignia of the United States Navy Supply Corps
Geography
County Londonderry, Northern Ireland, nicknamed 'the Oak Leaf County'
Oak Leaf, Texas, a city
Oakleaf Lake, a lake in Minnesota
Others
RFA Oakleaf, Royal Fleet Auxiliary ship names
Oakleaf Brewery, a brewery in England
Oak Leaf (house), a historic home in New York