A transformation playing card (sometimes referred to as a transformation deck when assembled into a complete set) is a type of playing card where an artist incorporates the pips of the non-face cards into an artistic design. In a classical transformation playing card, the pips retain their standard position and coloration on the card. In some variations, the pips may be different in size, location or color. There is some debate as to whether these cards, often referred to as semi-transformed, should be considered true transformation playing cards.

By the 19th century, the standard form for playing cards had become fixed in most of Europe and America. French cards used hearts, diamonds, spades and clubs. German cards used acorns, leaves, hearts and bells. It was at this time that designers in Germany, France and England began to draw small figures around the pips.

The first transformation playing cards were created by D.W. Soltan and D. Berger in 1801 as illustrations for a German edition of Hudibras. The cards illustrated were the 2 of hearts, 3 of hearts, 5 of hearts and 8 of hearts. In 1803, John Nixon published the first complete set (52 cards) of transformed cards. Titled Metastasis, this collection was also published as illustrations on sheets of paper.

Transformed cards became particularly popular in Victorian England. Their influence can be seen in John Tenniel's illustrations for Through the Looking Glass. Noted novelist and gambler William Makepeace Thackeray designed 21 card himself.

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