Operation Badr, also known as Plan Badr, was an Egyptian military offensive and operation across the Suez Canal that destroyed the Bar-Lev Line, a chain of Israeli fortifications along the frontline of the Israeli-occupied Sinai Peninsula, on 6 October 1973. It was launched in conjunction with a Syrian military offensive against the Israeli-occupied Golan Heights, triggering the Yom Kippur War. During the War of Attrition, which preceded Operation Badr, both Egypt and Syria had been seeking to recover the territories that Israel had captured from them during the 1967 Arab–Israeli War.

The Sinai Peninsula, which is a part of Egypt, has been militarily occupied by Israel twice since the beginning of the Arab–Israeli conflict: the first occupation lasted from October 1956 to March 1957, and the second occupation lasted from June 1967 to April 1982. Israel initially seized the Sinai Peninsula during the Suez Crisis, when it attacked Egypt in response to the Egyptian blockade against all Israeli shipping; the Egyptians had been contesting Israel's freedom of navigation through the Straits of Tiran and the Suez Canal since 1949, impacting the country's ability to import and export goods during the Israeli austerity period. Although the occupation allowed Israel to re-open the Straits of Tiran, the Suez Canal was closed until 1957, when Israeli troops withdrew from Egypt. In the mid-1960s, amidst warnings from Israeli officials that another blockade would be a casus belli, Egypt re-imposed the blockade against Israel and subsequently lost the Sinai Peninsula in the 1967 Arab–Israeli War. Like before, Israel's occupation allowed it to re-open the Straits of Tiran, but, once again, the Suez Canal was closed until 1975. For the next three years, Egypt, seeking to regain the territory it had lost, launched the unsuccessful War of Attrition against Israel. Later, a large-scale Egyptian military offensive against Israel, known as Operation Badr, triggered the 1973 Arab–Israeli War, which ended with the Israelis retaining control of the Sinai Peninsula. By 1979, the United States had successfully negotiated the Egypt–Israel peace treaty: the Egyptians recognized Israel as a sovereign state, recognized the Straits of Tiran and the Gulf of Aqaba as international waterways, and agreed to demilitarize along Israel's border. In exchange, Israel agreed to withdraw all civilians and soldiers from the Sinai Peninsula and return it to Egypt. On 25 April 1982, Israel's withdrawal concluded and Egypt has since left the Sinai Peninsula demilitarized, marking the first instance of peace between Israel and an Arab country.