A Lady in Her Bath is a painting by François Clouet. It was painted in 1571. It measures 92.3 x 81.2 cm (36 5/16 x 31 15/16 in.) The picture is in the National Gallery of Art, Washington DC. It is one of only three paintings signed by Clouet. The teenaged bather is unknown. It is possible that she is Diane de Poitiers, mistress of King Henry II of France when she was a teenager. Scholar Roger Trinquet suggested in 1966 that the teenaged lady is Mary Queen of Scots. The lady's face resembles other portraits of Mary, especially a drawing by Clouet depicting Mary in mourning. Trinquet believes the painting was intended as a satire for a Huguenot patron. The painting set a fashion for portraits of bathers.