The kkStB 97 were a class of 228 0-6-0T locomotive operated by the Imperial Royal Austrian State Railways (kaiserlich-königliche österreichische Staatsbahnen), or k.k.StB, for duties on secondary routes (Nebenbahnen) and branch lines (Lokalbahnen).

The locomotives of the Mürzzuschlag – Neuberg State Railway, on which the SB also ran, were also classified in the 100 series and given the operating numbers 20–21.

After the First World War, a large part of the class remained in Czechoslovakia, Yugoslavia, Italy, Poland and Romania.

The Romanian State Railways (CFR) also received locomotives of this class, but did not give them their own series designation.

The 89.240 was even equipped with a Giesl ejector in order to test the effects of this system on locomotives with lower power.