The 1964-D Roosevelt penny double die error is a coin that was minted in the United States in 1964. It is known for a unique and noticeable error in the minting process. The error occurs when the die used to strike the coin is engraved with a doubled image, resulting in a distinct doubling effect on certain parts of the design.

On the obverse side of the coin, the profile of President Franklin D. Roosevelt may appear slightly doubled, particularly on the letters of his name and the date. The doubling effect is most noticeable on the letters "IN GOD WE TRUST" and "LIBERTY." On the reverse side, the image of the torch, olive branch, and oak branch may also exhibit the doubling effect.

This double die error is highly sought after by collectors due to its rarity and uniqueness. It is considered a valuable and significant addition to any coin collection.