Hannibal (/ˈhænɪbəl/; Punic: 𐤇𐤍𐤁𐤏𐤋, romanized: Ḥanībaʿl; 247 – between 183 and 181 BC) was a Carthaginian general and statesman who commanded the forces of Carthage in their battle against the Roman Republic during the Second Punic War. Hannibal lived during a period of great tension in the Mediterranean Basin, triggered by the emergence of the Roman Republic as a great power with its defeat of Carthage in the First Punic War. Revanchism prevailed in Carthage, symbolized by the pledge that Hannibal made to his father to "never be a friend of Rome".

In 218 BC Hannibal attacked Saguntum (modern Sagunto, Spain), an ally of Rome in Hispania, sparking the Second Punic War. Hannibal invaded Italy by crossing the Alps with North African war elephants. In his first few years in Italy, as the leader of a Carthaginian and partially Celtic army, he won a succession of victories at the Battle of Ticinus, Trebia, Lake Trasimene, and Cannae, inflicting heavy losses on the Romans. Hannibal was distinguished for his ability to determine both his and his opponent's respective strengths and weaknesses, and to plan battles accordingly. His well-planned strategies allowed him to conquer and ally with several Italian cities that were previously allied to Rome. Hannibal occupied most of southern Italy for 15 years. The Romans, led by Fabius Maximus, avoided directly engaging him, instead waging a war of attrition (the Fabian strategy). Carthaginian defeats in Hispania prevented Hannibal from being reinforced, and he was unable to win a decisive victory. A counter-invasion of North Africa, led by the Roman general Scipio Africanus, forced him to return to Carthage. Hannibal was defeated at the Battle of Zama, ending the war in a Roman victory.

After the war, Hannibal successfully ran for the office of sufet. He enacted political and financial reforms to enable the payment of the war indemnity imposed by Rome. Those reforms were unpopular with members of the Carthaginian aristocracy and in Rome, and he fled into voluntary exile. During this time, he lived at the Seleucid court, where he acted as military advisor to Antiochus III the Great in his war against Rome. Antiochus met defeat at the Battle of Magnesia and was forced to accept Rome's terms, and Hannibal fled again, making a stop in the Kingdom of Armenia. His flight ended in the court of Bithynia. He was betrayed to the Romans and committed suicide by poisoning himself.

Hannibal is considered one of the greatest military tacticians and generals of Western antiquity, alongside Alexander the Great, Julius Caesar, Scipio Africanus, and Pyrrhus. According to Plutarch, Scipio asked Hannibal "who the greatest general was", to which Hannibal replied "either Alexander or Pyrrhus, then myself".

Hannibal was a common Semitic Phoenician-Carthaginian personal name. It is recorded in Carthaginian sources as ḤNBʿL (Punic: 𐤇𐤍𐤁𐤏𐤋). It is a combination of the common Phoenician masculine given name Hanno with the Northwest Semitic Canaanite deity Baal (lit, "lord") a major god of the Carthaginian's ancestral homeland of Phoenicia in Western Asia. Its precise vocalization remains a matter of debate. Suggested readings include Ḥannobaʿal, Ḥannibaʿl, or Ḥannibaʿal, meaning "Baʿal/The lord is gracious", "Baʿal Has Been Gracious", or "The Grace of Baʿal". It is equivalent to the fellow Semitic Hebrew name Haniel. Greek historians rendered the name as Anníbas (Ἀννίβας).

The Phoenicians and Carthaginians, like many West Asian Semitic peoples, did not use hereditary surnames but were typically distinguished from others bearing the same name using patronymics or epithets. Although he is by far the most famous Hannibal, when further clarification is necessary he is usually referred to as "Hannibal, son of Hamilcar", or "Hannibal the Barcid", to his father, Hamilcar Barca. Barca (Punic: 𐤁𐤓𐤒, BRQ) is a Semitic cognomen meaning "lightning" or "thunderbolt", a surname acquired by Hamilcar on account of the swiftness and ferocity of his attacks. Barca is cognate with similar names for lightning found among the Israelites, Assyrians, Babylonians, Arameans, Arabs, Amorites, Moabites, Edomites and other fellow Asiatic Semitic peoples. Although they did not inherit the surname from their father, Hamilcar's progeny are collectively known as the Barcids. Modern historians occasionally refer to Hannibal's brothers as Hasdrubal Barca and Mago Barca to distinguish them from the multitudes of other Carthaginians named Hasdrubal and Mago, but this practice is ahistorical and is rarely applied to Hannibal.

Hannibal was one of the sons of Carthaginian general and statesman Hamilcar Barca and an unknown mother. He was most likely born in Carthage, one of many Mediterranean regions colonised by the Canaanites from their homeland in Phoenicia. He had several sisters whose names are unknown and two brothers, Hasdrubal and Mago. His brothers-in-law were Hasdrubal the Fair and the Numidian king Naravas. He was still a child when his sisters married, and his brothers-in-law were close associates during his father's struggles in the Mercenary War and the Punic conquest of the Iberian Peninsula.

After Carthage's defeat in the First Punic War, Hamilcar set out to improve his family's and Carthage's fortunes. With that in mind and supported by Gades, Hamilcar began the subjugation of the tribes of the Iberian Peninsula. Carthage was in such a poor state at the time that it lacked a navy able to transport his army; instead, Hamilcar had to march his forces across Numidia towards the Pillars of Hercules and then cross the Strait of Gibraltar.