The Bellum Batonianum (Latin for War of the Batos) or Great Illyrian Revolt was a military conflict fought in the Roman province of Illyricum in the 1st century AD, in which an alliance of native peoples of the two regions of Illyricum, Dalmatia and Pannonia, revolted against the Romans. The Roman historian Suetonius described the uprising as the most difficult conflict faced by Rome since the Punic Wars two centuries earlier.

The rebellion began among native peoples who had been recruited as auxiliary troops for the Roman army. They were led by Bato the Daesitiate, a chieftain of the Daesitiatae in the central part of present-day Bosnia and Herzegovina, and were later joined by the Breuci, a tribe in Pannonia led by Bato the Breucian. Many other tribes in Illyria also joined the revolt.

Velleius Paterculus called it the Pannonian and Dalmatian War because it involved both regions of Illyricum.

The four-year war lasted from AD 6 to AD 9 and witnessed a large deployment of Roman forces in the province, with whole armies operating across the western Balkans and fighting on more than one front. In AD 8, the Breuci of the Sava valley surrendered, but it took a winter blockade and another season of fighting before the surrender in Dalmatia in AD 9.

Bato the Breucian betrayed Pinnes which later became the Ruler of the Breucians by the Romans.

Illyricum had seen some fighting during the Great Roman Civil War between Julius Caesar and the forces of the Senate led by Pompey several decades earlier. The Romans who lived in some of the coastal towns supported Caesar, while the native peoples largely supported Pompey. Quintus Cornificius, a Caesarian, repulsed Quintus Octavius, a Pompeian. The Dalmatians routed Aulus Gabinius, a Caesarian who had been ordered by Caesar to join Cornificius in Illyricum. The Dalmatians later asked Caesar for a pardon. Caesar demanded a tribute and hostages as compensation, which was standard practice, and sent Publius Vatinius with three legions to enforce this. After Caesar was assassinated in 44 BC, the Dalmatians ignored these demands and routed five of Vatinius' cohorts. With the disruptions caused by further Roman civil wars in the years following, Dalmatian piracy in the Adriatic Sea became a problem again.

In 35 BC, the Iapydes, the northernmost tribe of Dalmatia, carried out raids into northeastern Italy. They attacked Aquileia, and plundered Tergestus (Trieste). From 35 to 33 BC Octavian (who would soon become the emperor Augustus) undertook military campaigns in the region. He defeated the Iapydes and then pushed into southern Pannonia, where he seized the city of Segesta (which later, as a Roman town, was called Siscia). He then turned on the Dalmatians and captured Promona (to the northeast of modern Drniš, Croatia) on the coast, the main city of the Liburnians, which had been seized by the Dalmatians. After that he took the Dalmatian cities of Sunodium and Setovia. He then moved upon the Derbani, who sued for peace. He also destroyed the settlements on the islands of Melite (Mljet) and Melaina Corcyra (Korčula), and deprived the Liburnians of their ships, because all were involved in piracy. Octavian's lieutenants conducted various other operations in the region. Octavian temporarily restored Roman authority in Dalmatia and pushed into southern Pannonia, which had never before been reached by Roman armies.

In 27 BC, the first settlement between Octavian and the Roman Senate formalised Octavian's absolute rule, bestowing the title of Augustus on him and making him the first Roman emperor. It also made arrangements about the provinces of the empire. Most provinces remained senatorial provinces, whose governors were chosen by the Senate from among the senators, while the frontier provinces became imperial provinces, whose governors were appointed by Augustus. The province of Illyricum was constituted out of both Dalmatia and the newly conquered southern Pannonia, and, despite being a frontier province, was designated as a senatorial province.