A card sharp is a person who uses skill and/or deception to win at card games. "Sharp" and "shark" spellings have varied over time and by region.

The Card Sharp with the Ace of Diamonds is an oil-on-canvas painting produced c. 1636–1638 by the French artist Georges de La Tour. It is now in the Louvre, which bought it in 1972. Though its commissioner is unknown, it is signed Georgius De La Tour fecit under the card sharp's elbow and in the shadow of the tablecloth.