The Mitsubishi Fuso Aero Midi (kana: 三菱ふそう・エアロミディ) is a step-entrance, low entry and low floor midibus produced by the Japanese manufacturer Mitsubishi Fuso.

The Aero Midi appeared in 1988 after the replacement for the MK Series.

The Mitsubishi Fuso Aero Midi is the low entry and smaller version of the low floor Mitsubishi Fuso Aero Star city bus.

The Aero Midi-S is a rebadged Nissan Diesel Space Runner RM and Nissan Diesel Space Runner JP.

A common design is that it has a rounded roof dome (similar to the Nissan Diesel Space Runner RM and the Nissan Diesel Space Runner JP) with a double-curvature windscreen and a separately mounted destination sign.