| Named By: | M. Bisconti in 2010 |
| Time Period: | Late Miocene |
| Location: | Italy |
| Size: | Unavailable |
| Diet: | Filter feeder |
| Fossil(s): | Partial remains |
| Classification: | | Chordata | Mammalia | Cetacea | Mysticeti | Balaenopteridae | |
Plesiobalaenoptera is a genus of extinct rorqual which existed in Italy during the late Miocene epoch. The type species is P. quarantellii. It is the oldest known rorqual from the Mediterranean basin. Fossils have been found from sediments of the Stirone River in northern Italy (44.8degN 10.0degE / 44.8; 10.0, paleocoordinates 43.9degN 10.5degE / 43.9; 10.5) that were deposited during the Tortonian age, around 11 to 7 million years ago.