Cookie jars are utilitarian or decorative ceramic or glass jars often found in American and Canadian kitchens. In the United Kingdom, they are known as biscuit barrels^[1] or biscuit jars.^[2] If they are cans made out of tinplate, they are called biscuit tins.^[3] While used to store actual cookies or biscuits, they are sometimes employed to store other edible items like candy or dog treats, or non-edible items like currency (in the manner of a piggy bank).

• Sometimes the phrase "keep your hands out of the cookie jar" is a way of telling someone to stay out of other people's business, even when doing so seems lucrative.
• In financial reporting, "cookie jar accounting" is the practice of increasing reserves during good years and "eating them up" during bad years. This process of income smoothing is allowed, but non-disclosure – especially in order to consistently reach performance targets – is illegal.
• In computer programming, a "cookie jar" is an area of memory set aside for storing cookies.

• "Who Stole the Cookie from the Cookie Jar?" is an elementary school song.
• The American band Gym Class Heroes wrote a song called "Cookie Jar" which was released as a single in 2008.
• Musician Jack Johnson wrote a song called "Cookie Jar", on the 2003 album On and On.
• South Korean girl group Red Velvet released their debut Japanese EP titled #Cookie Jar in 2017, along with its lead single of the same name.

• 
  A rocket ship from American Bisque, ca. 1960. Space themes were popular as the space race began in earnest during the late 1950s
• 
  An American Bisque cookie jar using the Funny Animal theme popular in America during the 1950s
• 
  Wooden biscuit barrel from Ireland, early 20th century

• Media related to cookie jars at Wikimedia Commons
• Warhol's World on View: Gems to Cookie Jars
• Collector Found His Passion In Cookie Jars Video produced by Wisconsin Public Television