Jasieńczyk is a Polish coat of arms. It was used by several szlachta families in the times of the Polish–Lithuanian Commonwealth.

The first known use of these arms is dated 1406. Earliest version was Jasiona and had two keys in saltire. A bearer of this coat of arms was Chancellor of the Exchequer - Treasurer of Poland, and the history of these arms is presumed to be attributable to ecclesiastical iconography.

Azure a key or, the wards in chief.

Notable bearers of this coat of arms include:

• Witold Malkuzynski
• Gregg Jenczyk

• Polish heraldry
• Heraldry
• Coat of arms

• J. Lyčkoŭski. "Belarusian Nobility Coats of Arms". Archived from the original on 2017-09-27. Retrieved 2017-11-24. (in English)
• "Armorial of Belarusian Nobility". Archived from the original on 2017-12-01. Retrieved 2017-11-24. (in English)