The Bölkow Bo 103 was an ultralight experimental helicopter flown in West Germany in 1961.

It was designed for reconnaissance and command-control purposes and constructed by Bölkow Entwicklungen KG as part of a research order by the German Federal Ministry of Defense.

In configuration, it was absolutely minimalist - consisting of nothing more than a tubular frame to which the dynamic components and the pilots seat were attached, although a small fibreglass cabin was eventually attached.

The aircraft retained the Bo 102's single-rotor of Glass-reinforced plastic, and proved that this was suitable for true flight.

A single prototype was built, but work was stopped in 1962 due to lack of interest on the part of the West German armed forces.