| Lafnitz | |
| Subdivision Type1: | Country |
| Subdivision Type2: | Countries |
| Subdivision Name2: | Austria and Hungary |
| Length: | 113.6km (70.6miles) |
| Source1 Location: | east of the Kreuzwirt, municipality of Wenigzell, Joglland |
| Mouth Location: | near Szentgotthárd into the Raab |
| Basin Size: | 1992km2 |
| Tributaries Right: | Voraubach, Safen,, |
| Custom Label: | References |
The Lafnitz (hu|Lapincs) is a river in southeastern Austria and (briefly) western Hungary.
The Lafnitz is 113.6km (70.6miles) long, and has a basin area of 1992km2.[1] It rises near the border of Styria and Lower Austria, and flows in a generally southeastern direction through the towns of Rohrbach an der Lafnitz, Lafnitz, Markt Allhau, Wolfau, Wörth an der Lafnitz, Neudau, Deutsch Kaltenbrunn, Rudersdorf, Königsdorf, and Heiligenkreuz im Lafnitztal, and it empties into the Rába less than a kilometer inside Hungary, in the town of Szentgotthárd. For much of its length it forms the border between Styria and Burgenland. Its largest tributary is the .