The 1972–73 Rheinlandliga was the 21st season of the highest amateur class of the Rhineland Football Association under the name of 1.
Last years relegation team from the Regional League, SpVgg Andernach, became Rhineland champion.
[1] SC Oberlahnstein represented Rhineland in the 1973 German Soccer Amateur Championship and lost in the second round to the amateurs of 1.
All three newcomers, Eintracht Höhr-Grenzhausen, Ahrweiler BC and SV Ehrang moved down 2.
[2] SC Oberlahnstein and SV Niederlahnstein merged after the season to become SG Eintracht Lahnstein.