Pieter Janssens Elinga (1623–1682) was a Dutch Golden Age painter, mainly of domestic interior scenes with a strong emphasis on the rectangular geometrical elements of windows, floor tiling paintings, and other elements, and a few genre figures.

He was born in Bruges as the son of Gisbrecht Janssens, who probably taught him to paint.

Elinga was a follower of Pieter de Hooch and Willem Kalf.

Perspective boxes were experiments with light, architectural elements, and the camera obscura.

Samuel van Hoogstraten also made one, which is on show at the National Gallery.