Death of a Delft Blue is a 1964 mystery detective novel by the British writer Gladys Mitchell.

[1] It is the thirty seventh in the long-running series of books featuring Mitchell's best known character, the psychoanalyst and amateur detective Mrs Bradley.

While attending a conference in the Netherlands, Mrs Bradley encounters an eccentric Dutch family including a young woman under pressure to marry her cousin, to the outrage of her handsome brother Florian.

While Florian is sitting for a portrait commissioned by his aunt in which he is holding a delft blue object, he disappears.

Shortly afterwards two local barmaids die after eating poisoned chocolates which may have been intended for Florian.