Portrait of Nicolaus Kratzer is a 1528 half-length portrait by Hans Holbein the Younger.

It is now in the Louvre,[1] whilst a copy after it hangs in the National Portrait Gallery.

[2] It shows the astronomer Nikolaus Kratzer, a friend of Thomas More and Holbein himself.

In his hand he holds a half-finished polyhedral sundial, whilst on the shelves behind him are a semi-circular star quadrant, a shepherd's dial and other instruments.

This article about a sixteenth-century painting is a stub.