The Arab–Israeli conflict is an ongoing intercommunal phenomenon involving political tension, military conflicts, and other disputes between Arab countries and Israel, which escalated during the 20th century, but had mostly faded out by the early 21st century. The roots of the Arab–Israeli conflict have been attributed to the support by Arab League member countries for the Palestinians, a fellow League member, in the ongoing Israeli–Palestinian conflict; this in turn has been attributed to the simultaneous rise of Zionism and Arab nationalism towards the end of the 19th century, though the two national movements had not clashed until the 1920s.

Part of the Palestine–Israel conflict arose from the conflicting claims by these movements to the land that formed the British Mandatory Palestine, which was regarded by the Jewish people as their ancestral homeland, while at the same time it was regarded by the Pan-Arab movement as historically and currently belonging to the Arab Palestinians, and in the Pan-Islamic context, as Muslim lands. The sectarian conflict within the British Mandate territory between Palestinian Jews and Arabs escalated into a full-scale Palestinian civil war in 1947. Taking the side of the Palestinian Arabs, especially following the Israeli Declaration of Independence, the neighbouring Arab countries invaded the by-then former Mandate territory in May 1948, commencing the First Arab–Israeli War. Large-scale hostilities mostly ended with ceasefire agreements after the 1973 Yom Kippur War. Peace agreements were signed between Israel and Egypt in 1979, resulting in Israeli withdrawal from the Sinai Peninsula and the abolition of the military governance system in the West Bank and Gaza Strip, in favor of Israeli Civil Administration and consequent unilateral annexation of the Golan Heights and East Jerusalem.

The nature of the conflict has shifted over the years from the large-scale, regional Arab–Israeli conflict to a more local Israeli–Palestinian conflict, which peaked during the 1982 Lebanon War when Israel intervened in the Lebanese Civil War to oust the Palestinian Liberation Organization from Lebanon. By 1983, Israel reached normalization with Christian-dominated Lebanese government, but the agreement was annulled the next year with Muslim and Druze militias' takeover of Beirut. With the decline of the 1987–1993 First Palestinian Intifada, the interim Oslo Accords led to the creation of the Palestinian National Authority in 1994, within the context of the Israeli–Palestinian peace process. The same year, Israel and Jordan reached a peace accord. In 2002, the Arab League offered recognition of Israel by Arab countries as part of the resolution of the Palestine–Israel conflict in the Arab Peace Initiative. The initiative, which has been reconfirmed since, calls for normalizing relations between the Arab League and Israel, in exchange for a full withdrawal by Israel from the occupied territories (including East Jerusalem) and a "just settlement" of the Palestinian refugee problem based on UN Resolution 194. In the 1990s and early 2000s, a cease-fire had been largely maintained between Israel and Baathist Syria, as well as with Lebanon. Despite the peace agreements with Egypt and Jordan, the interim peace accords with the Palestinian Authority and the generally existing cease-fire, until the mid-2010s the Arab League and Israel had remained at odds with each other over many issues. Among Arab belligerents in the conflict, Iraq and Syria are the only states who have reached no formal peace accord or treaty with Israel, both however turning to support Iran.

Developments in the course of the Syrian Civil War reshuffled the situation near Israel's northern border, putting the Syrian Arab Republic, Hezbollah and the Syrian opposition at odds with each other and complicating their relations with Israel, upon the emerging warfare with Iran. The conflict between Israel and Hamas-ruled Gaza, is also attributed to the Iran–Israel proxy conflict in the region. By 2017, Israel and several Arab Sunni states led by Saudi Arabia formed a semi-official coalition to confront Iran. This move and the Israeli normalization with Gulf States was marked by some as the fading of the Arab–Israeli conflict.