Rumi Matsui (松井るみ, born in Osaka, Japan) is a Japanese set designer and scenographer based in Tokyo.
In 1985 Rumi Matsui completed her BA in graphic design at Tama Art University and joined Shiki Theatre Company.
After her return to Japan in 1990, Matsui began her career as a set designer and scenographer establishing Centreline Associates Inc. in 1991.
In recent years, she has been expanding her practice to concert set design, notably including Japanese pop group AKB48 at the National Athletic Stadium in 2014.
Matsui also contributed the scenic design to Korin; a play inspired by ancient mythology about the origin of Japan, which was given as an offering to and performed at Kyoto's oldest Shinto shrine Kamigamo Jinja.