Oak leaf or Oakleaf may refer to:

• the leaf of an oak
• oak leaf lettuce, from the Lactuca sativa group
• Any member of the butterfly genus Kallima
  • The species Kallima knyvetti

• 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

• County Londonderry, Northern Ireland, nicknamed 'the Oak Leaf County'
• Oak Leaf, Texas, a city
• Oakleaf Lake, a lake in Minnesota

• RFA Oakleaf, Royal Fleet Auxiliary ship names
• Oakleaf Brewery, a brewery in England