The Yamaha FZR400 was a 400 cc (24 cu in) class sport bike produced by Yamaha Motor Company between 1987 and 1994.

All FZR400s were powered by naturally aspirated, carburetted, liquid-cooled 399cc four-stroke inline-four engines with four valves per cylinder and dual overhead camshafts (DOHC).

These engines were all mounted transversely in perimeter type box-section aluminium 'Deltabox' frames.

Although standard-fare for modern sport bikes, in 1988 this layout was quite unique.

An earlier model called FZ400R was released only in Japan in 1984.