This is a list of Roman legions. These are mainly legions of the Roman Empire; earlier legions were not permanent named organizations.

Comments added include life span of the legion, cause of disappearance (if relevant) and the original commander, meaning, the man who levied the legion.

• Legio I - referred to once as "I Germanica" – 48 BC to 70 AD (Batavian rebellion), Julius Caesar
• Legio I Adiutrix - 68 AD to (at least) 444 AD, Galba?
• Legio I Italica - September 22 66 AD to (at least) 5th century, Nero
• Legio I Macriana liberatrix – 68 to 69 AD, Lucius Clodius Macer, governor of Africa
• Legio I Minervia - 82 AD to (at least) 4th century, Domitian
• Legio I Parthica - 197 to early 6th century, Septimius Severus
• Legio II Adiutrix pia fidelis - 70 AD to (at least) 3rd century, Vespasian
• Legio II Augusta - 30s BC(?)
• Legio II Italica - 165 to beginning of the 5th century, Marcus Aurelius
• Legio II Parthica – 197 AD until, at least half of 4th century, Lucius Septimius Severus
• Legio II Traiana fortis - 105 AD to (at least) 5th century, Trajan
• Legio III Augusta – 43 BC to (at least) late 4th century, Augustus
• Legio III Cyrenaica – probably around 36 BC to (at least) 5th century, probably Marcus Antonius
• Legio III Gallica – around 49 BC to at least early 4th century, Julius Caesar
• Legio III Italica - around 49 BC to at least early 4th century, Marcus Aurelius
• Legio III Parthica - - around 197 to at least early 5th century, Lucius Septimius Severus
• Legio IV Flavia firma - see Legio IV Macedonica
• Legio IV Macedonica - 48 BC to 70 AD (disbanded by Vespasian), Julius Caesar
• Legio IV Scythica - around 42 BC to at least early 5th century, Marcus Antonius
• Legio V Alaudae, 52 BC to 70 AD (destroyed in the Batavian rebellion), Julius Caesar
• Legio V Macedonica
• Legio VI Ferrata
• Legio VI Victrix
• Legio VII
• Legio VII Gemina
• Legio VIII Augusta, 59 BC to 4th century AD - Caesar
• Legio IX Hispana - before 58 BC to around 160 AD, probably Julius Caesar
• Legio X Equestris – 58 BC to (at least) 5th century, Julius Caesar
• Legio X Fretensis
• Legio X Gemina - 58 BC to (at least) 5th century, Julius Caesar
• Legio XI - Octavian
• Legio XII Fulminata - Caesar
• Legio XIII Gemina - 57 BC to (at least) 5th century, Julius Caesar
• Legio XIV Gemina - Octavian
• Legio XV Apollinaris - Octavian
• Legio XV Primigenia - 39 to 70 AD (destroyed in the Batavian rebellion), Caligula
• Legio XVI - Octavian
• Legio XVI Flavia Firma
• Legio XVII - probably around 41 BC to 9 AD – destroyed in the Battle of Teutoburg Forest, Augustus
• Legio XVIII - probably around 41 BC to 9 AD – destroyed in the Battle of Teutoburg Forest, Augustus
• Legio XIX - 41 or 40 BC to 9 AD (destroyed in the Battle of the Teutoburg Forest), Augustus
• Legio XX Valeria Victrix – probably around 25 AD to late 3rd century, Augustus
• Legio XXI Rapax - 31 BC to 92 AD (destroyed in Pannonia), Augustus
• Legio XXII Deotariana - 48 BC to ca 133 (destroyed in the jewish rebellion), Deiotarius
• Legio XXII Primigenia - 39 to (at least) 3rd century, Caligula
• Legio XXX Ulpia Victrix - 105 to early 5th century, Trajan

• Oxford Classical Dictionary