The legitimacy of the State of Israel has been challenged since before the state was formed. There has been opposition to Zionism, the movement to establish a Jewish state in Palestine, since its emergence in 19th-century Europe. Since the establishment of the State of Israel in 1948, a number of individuals, organizations, and states have challenged Israel's political legitimacy and its occupation of territories belonging to Palestine, Syria and Lebanon. Over the course of the Israeli–Palestinian conflict and broader Arab–Israeli conflict, the country's authority has also been questioned on a number of fronts.
Criticism of Israel may include opposition to the country's right to exist or, since the 1967 Arab–Israeli War, the established power structure within the Israeli-occupied territories. Israel has also been accused of crimes against humanity and war crimes—such as apartheid, starvation and genocide—including by scholars, legal experts, and human rights organizations. Israel regards such criticism as attempts to delegitimize it. Israel has also been criticized for maintaining "the longest and one of the most deadly military occupations in the world".