Windows Open Simultaneously 1st Part, 3rd Motif (French: Fenêtres ouvertes simultanément Ière partie 3e motif) is an oil-on-canvas painting by French painter Robert Delaunay, created in 1912.

The current painting, like its predecessor, Simultaneous Windows 2nd Motif, 1st Part, is held at the Solomon R. Guggenheim Museum, in New York.

[1] A painting with the same title is held at Tate Modern, in London.

However, some references are still visible here, like the almost undetectable presence of the Eiffel Tower, in the green colour, at the center.

The artist had been inspired by analytic cubism in his geometric forms, but this orphic composition is defined by the usage or diaphanous and prismatic colours.