A Lady Playing the Guitar (after 1670s) is an oil on canvas painting by an unknown copyist after a c. 1672 work by the Dutch painter Johannes Vermeer.

It is an example of Dutch Golden Age painting and is part of the collection of the Philadelphia Museum of Art.

A young lady with fresh red cheeks, wearing a white silk dress and a yellow jacket trimmed with ermine, sits on the left facing the spectator.

It is thanks to Johnson's deeply founded interest in art that all dubious attributions of paintings in his possession such as this one were allowed to remain in the collection, where it has become a quiet testament to the "Vermeer craze" at the turn of the 20th-century.

Even after seeing the Kenwood House version, Hofstede de Groot was convinced of this painting's superiority, which demonstrates the skill of the unknown copyist.

The provenance records mentioned by Hofstede de Groot pertain however to the Kenwood House version.