5 decal variants:
1. Bü-133C, Legion Condor, Tablada, Spain 1936
2. Bü-133C, Swiss A.F., Thun, Schweiz 1946
3. Bü-133C, LY-LAD, Kaunas, Lithuania 1938
4. Bü-133C, Yugoslavia partyzan A.F., 1945
5. Bü-133C, SAAF, South Africa, 1945
First flown in 1935 (by Luise Hoffmann, the first female works pilot in Germany), it was slightly smaller than the Bü 131. The prototype, D-EVEO, was powered by a 140 hp (104 kW) Hirth HM506 inverted, air-cooled inline-6 engine. The aircraft showed "astonishing agility" at its first public appearance, the 1936 International Aerobatic Championship at Rangsdorf, but the Bü 133A garnered no orders; only two Bü 133Bs, with 160 hp (119 kW) version of that same Hirth HM506 inline-6 engine, were built. The main production type was the 160 hp (119 kW) Siemens-Bramo Sh 14A radial powered Bü 133C, which had a distinctive cowling and a 13 cm (5.1 in)-shorter fuselage, and the same fine aerobatic performance as the Bü 133A.