Pamiętnik handlowca (A Merchant's Memoir, or Memoirs of a Merchant; in Latin, Memorialium commercatori) is the name of a purported diary written by a Polish merchant, Zbigniew Stefański, in 1625. No copy of the original text is known to exist. The diary was said to be written in Old Polish and to contain a first-hand account of the Jamestown Colony in Virginia. It was claimed to be the only extant primary source from the Jamestown Colony that provides the perspective of Polish artisans who had been brought in by Captain John Smith in 1608. As the existence of the diary has been confirmed by only a single researcher, its veracity and very existence have been questioned.