Here are some facts about the electoral process:
Voting will take place inside Egypt from December 10 to 12. Egyptians abroad voted from the first of December to the third of the same month.
The results are due to be announced on December 18, with one candidate needing an absolute majority to avoid a run-off in early January.
Sisi won the previous two presidential terms in 2014 and 2018 after receiving 97 percent of the vote.
According to the National Elections Authority, some 67 million Egyptians over the age of 18 are eligible to vote out of a total population of 104 million.
Among those banned from voting are those mentally ill, those convicted of final sentences for crimes including tax evasion and political corruption, and those convicted with custodial sentences.
The candidates running are Abdel Fattah al-Sisi, president since 2014, Farid Zahran, head of the center-left Egyptian Social Democratic Party, Abdel Sanad al-Yamama, head of the liberal Wafd Party, and Hazem Omar, head of the Republican People's Party.
The National Elections Authority is responsible for supervising and administering all elections and referendums in Egypt.
The elections will be held under judicial supervision and accredited local and foreign civil society organizations will be allowed to monitor the vote, the commission says.
Term of office:
Constitutional amendments made in 2019 included extending the presidential term to 6 years from 4 years.
The amendments removed an explicit requirement that no president could serve more than two terms, replacing it with a provision saying no person could serve more than two consecutive terms.
The amendments included an added article that allowed Sisi's second term to be extended to six years instead of 6 and allowed him to run for a third term in accordance with the new rules.