A ghazi, or gazi (Arabic: غازي, Arabic pronunciation: [ɣaːziː], plural ġuzāt) is an individual who participated in ghazw (غزو, ġazw), meaning military expeditions or raids against Infidels. The latter term was applied in early Islamic literature to expeditions led by the Islamic prophet Muhammad, and later taken up by Turkic military leaders to describe their wars of conquest.

In the context of the wars between Russia and the Muslim peoples of the Caucasus, starting as early as the late 18th century's Sheikh Mansur's resistance to Russian expansion, the word usually appears in the form gazavat (газават).

In English-language literature, the ghazw often appears as razzia, a borrowing through French from Maghrebi Arabic.

In modern Turkic languages, such as Turkish and Azerbaijani, gazi is used to refer to veterans, and also as a title for Turkic Muslim champions such as Ertuğrul and Osman I.

In pre-Islamic Bedouin culture, ghazw[a] was a form of limited warfare verging on brigandage that avoided head-on confrontations and instead emphasized raiding and looting, usually of livestock (see cattle raiding). The Umayyad-period Bedouin poet al-Kutami wrote the oft-quoted verses: "Our business is to make raids on the enemy, on our neighbor and our own brother, in the event we find none to raid but a brother." William Montgomery Watt hypothesized that Muhammad found it useful to divert this continuous internecine warfare toward his enemies, making it the basis of his war strategy; according to Watt, the celebrated battle of Badr started as one such razzia. As a form of warfare, the razzia was then mimicked by the Christian states of Iberia in their relations with the taifa states; rough synonyms and similar tactics are the Iberian cavalgada and the Anglo-French chevauchée.

The word razzia was used in French colonial context particularly for raids to plunder and capture slaves from among the people of Western and Central Africa, also known as rezzou when practiced by the Tuareg. The word was adopted from ġaziya of Algerian Arabic vernacular and later became a figurative name for any act of pillage, with its verb form razzier.

Ghazi (Arabic: غازي, ġāzī) is an Arabic word, the active participle of the verb ġazā, meaning 'to carry out a military expedition or raid'; the same verb can also mean 'to strive for' and Ghazi can thus share a similar meaning to Mujahid or "one who struggles". The verbal noun of ġazā is ġazw or ġazawān, with the meaning 'raiding'. A derived singulative in ġazwah refers to a single battle or raid. The term ghāzī dates to at least the Samanid period, where he appears as a mercenary and frontier fighter in Khorasan and Transoxiana. Later, up to 20,000 of them took part in the Indian campaigns of Mahmud of Ghazni.

Ghāzī warriors depended upon plunder for their livelihood, and were prone to brigandage and sedition in times of peace. The corporations into which they organized themselves attracted adventurers, zealots and religious and political dissidents of all ethnicities. In time, though, soldiers of Turkic ethnicity predominated, mirroring the acquisition of Mamluks, Turkic slaves in the Mamluk retinues and guard corps of the caliphs and emirs and in the ranks of the ghazi corporation, some of whom would ultimately rise to military and later political dominance in various Muslim states.