Opal Screen I & II are two autonomous stained glass artworks designed by Brian Clarke in 1987. They feature Clarke’s signature grid motif in white and blue, with amorphs in varying colours disrupting the order of the underlying structure. The works' titles refers to the technique employed in their execution. Opal glass, a material first manufactured in sixteenth-century Venice, is produced by adding opacifiers to molten glass, which scatter light and generate secondary colours, evoking the appearance of the eponymous gemstone.

These two stained glass works were commissioned by the Sezon Museum of Modern Art in 1987 and installed at the Seibu Forum in Tokyo.