The Battle of Abritus, also known as the Battle of Forum Terebronii, occurred near Abritus in the Roman province of Moesia Inferior in the summer of 251. It was fought between the Romans and a federation of Gothic and Scythian tribesmen under the Gothic king Cniva. The Roman army was soundly defeated, and Roman emperors Decius and Herennius Etruscus, his son, were both killed in battle. It was one of the worst defeats suffered by the Roman Empire against the Germanic tribes, rated by the Roman historian Ammianus Marcellinus as on par with the Battle of the Teutoburg Forest in 9 AD, the Marcomannic invasion of Roman Italy in 170, and the Battle of Adrianople in 378.

Abritus (Abrittus) was an impressive Roman walled city and one of the biggest urban centres in the province of Moesia Inferior. Its remains are in the Archaeological Park of Razgrad.