Porus or Poros (from the Greek Πῶρος, Pôros), was a king of the Pauravas whose territory in Ancient Punjab spanned the region between the Hydaspes ( Jhelum) and Acesines ( Chenab) rivers in what is now the Punjab. Porus fought against Alexander the Great in the Battle of the Hydaspes, thought to be fought at the site of modern-day Mong, Punjab. Alexander was however greatly impressed by his adversary and not only reinstated him as a satrap of his own kingdom but also granted him dominion over lands to the south-east extending until the Hyphasis ( Beas).

After Alexander's death in 323 BC, Porus was assassinated by one of Alexander's generals named Eudemus sometime between 321 and 315 BC.