Turnout was low, but the roughly 40 percent of Egyptians who did head to the polls this week overwhelmingly backed the interim government's new constitution.
State media reports around 90 percent of those who voted approved the constitution, which guarantees freedom of beliefs, equality between men and women and bans political parties from being formed based on religion, race or geography.
The outcome nudges army chief General Abdel Fattah al-Sisi a step closer to running for president.
Experts say Sisi, who is extremely popular among his supporters, appears the only serious candidate, but he hasn't yet indicated whether he will run.
A decree is expected within the next few days setting the date for presidential and parliamentary elections.