The South Palatinate railway or Südpfalzbahn is a railway line in western Germany that runs from Landau via Pirmasens and Zweibrücken to Rohrbach.
Since 1994 the timetable for this line has been divided into route no. KBS 674 Schwarzbachtalbahn Pirmasens Nord-Saarbrücken and KBS 675 Queichtalbahn Landau (Pfalz)-Pirmasens Nord. From 1971 to 1992 it was listed in the timetable as KBS 680, and from 1992 as KBS 674. The section fron Biebermühle (since 1936 Pirmasens Nord)-Pirmasens (today the Biebermühl railway (Biebermühlbahn).
The line was opened for the first time along its entire length on 25 November by the Palatinate Railway (Pfalzbahn). In 1888 the line was doubled. After the Second World War it reverted to a single track.