Lokomotivfabrik Floridsdorf (Floridsdorf locomotive factory) was an Austrian locomotive works founded on 6 September 1869 that achieved a pre-eminent place amongst European locomotive builders thanks to the quality and diversity of its designs.
Common abbreviations for the company include Flor, WLF (Wiener Lokomotivfabrik Floridsdorf) and LOFAG (Lokomotivfabrik Floridsdorf AG).
Lokomotivfabrik Floridsdorf was the third factory of its type to emerge in Austria following the Lokomotivfabrik der Staatseisenbahngesellschaft (StEG, Vienna) and that of Georg Sigl, the Wiener Neustädter Lokomotivfabrik, both based in Vienna.