Nasserism is an Arab nationalist political ideology based on the thinking of the former Egyptian President Gamal Abdel Nasser. It was a major influence on pan-Arab politics in the 1950s and 1960s, and continues to have significant resonance throughout the Arab World to this day. It also metamorphosed into other nationalist movements during the 1970s. However, the scale of the Arab defeat in the Six Day War of 1967 severely damaged the standing of Nasser, and the ideology associated with him. Nasser himself died in 1970, and certain important tenets of Nasserism were revised or abandoned totally by his successor as Egyptian President, Anwar El-Sadat. During Nasser's lifetime, Nasserist groups were encouraged and often supported financially by Egypt, to the extent that many became seen as willing agents of the Egyptian Government.

Nasserism is an Arab nationalist and pan-Arab ideology, combined with a vaguely defined socialism, often distinguished from Eastern bloc or Western socialist thought by the label 'Arab socialism'. Though opposed ideologically to Western capitalism, Arab socialism also developed as a rejection of communism, which was seen as incompatible with Arab traditions, and the religious underpinnings of Arab society. As a consequence, Nasserists from the 1950s to the 1980s sought to prevent the rise of communism in the Arab World, and advocated harsh penalties for individuals and organizations identified as attempting to spread communism within the region.

Anwar El Sadat (Arabic: محمد أنور السادات‎ Anwar as-Sādāt, Egyptian Arabic pronunciation: [mæˈħæmmæd ˈʔɑnwɑɾˤ essæˈdæːt]; 25 December 1918 – 6 October 1981) was the third President of Egypt, serving from 15 October 1970 until his assassination by fundamentalist army officers on 6 October 1981. In his eleven years as president he changed Egypt's direction, departing from some of the economic and political principles of Nasserism by re-instituting the multi-party system, and launching the Infitah economic policy.

He was a senior member of the Free Officers group that overthrew the Muhammad Ali Dynasty in the Egyptian Revolution of 1952, and a close confidant of President Gamal Abdul Nasser, whom he succeeded as President in 1970. As president he led Egypt in the October War of 1973 to re-acquire Egyptian territory lost to Israel in the 1967 Six-Day War, making him a hero in Egypt and, for a time, the wider Arab World. Afterwards he engaged in negotiations with Israel, culminating in the Egypt–Israel Peace Treaty. This won him the Nobel Peace Prize but also made him unpopular among some Arabs, resulting in a temporary suspension of Egypt's membership in the Arab League, and eventually his assassination.

Gamal Abdel Nasser Hussein (Arabic: جمال عبد الناصر حسين‎, IPA: [ɡæˈmæːl ʕæbdenˈnɑːsˤeɾ ħeˈseːn]; 15 January 1918 – 28 September 1970) was the second President of Egypt from 1956 until his death. A colonel in the Egyptian army, Nasser led the Egyptian Revolution of 1952 along with Muhammad Naguib, the first president, which overthrew the monarchy of Egypt and Sudan, and heralded a new period of modernization, and socialist reform in Egypt together with a profound advancement of pan-Arab nationalism, including a short-lived union with Syria.

Nasser is seen as one of the most important political figures in both modern Arab history and politics in the 20th century. Under his leadership, Egypt nationalized the Suez Canal Company and came to play a central role in anti-imperialist efforts in the Arab World and Africa. The imposed ending to the Suez Crisis made him a hero throughout the Arab world. He was also instrumental in the establishment of the international Non-Aligned Movement. He is well known for his nationalist policies and version of pan-Arabism, also referred to as Nasserism, which won a great following in the Arab World during the 1950s and 1960s. Although his status as "leader of the Arabs" was badly damaged by the Israeli victory over the Arab armies in the Six-Day War, as well as Egypt's failure to win the subsequent War of Attrition against Israel, many in the general Arab population still view Nasser as a symbol of Arab dignity and freedom.