The final result showed Hassan won 97.66 percent of the vote, dominating every constituency, the electoral commission announced on state television.
A quick swearing-in ceremony would take place on Saturday, state TV said.
The main opposition party, Chadema, says hundreds of people have been killed by security forces since protests broke out on election day on Wednesday.
Hassan was elevated from vice-president on the sudden death of her predecessor, John Magufuli, in 2021.
She has faced opposition from parts of the army and Magufuli's allies, and sought to cement her position with an emphatic win, analysts say.
Rights groups say she oversaw a "wave of terror" in the east African nation ahead of the vote, including a string of high-profile abductions that escalated in the final days.
Chadema was barred from taking part in the election and its leader put on trial for treason.
Despite a heavy security presence, election day descended into chaos as crowds took to the streets across the country, tearing down her posters and attacking police and polling stations, leading to an internet shutdown and curfew.
A Chadema spokesman told AFP on Friday that "around 700" people had been killed, based on figures gathered from a network checking hospitals and health clinics.
A security source and diplomat in Dar es Salaam both told AFP that deaths were "in the hundreds".
Hassan has not made any public statement since the unrest began.
Her government denies using "excessive force" but has blocked the internet and imposed a tight lockdown and curfew nationwide, making it hard to get any information.
News websites have not been updated since early Wednesday and journalists are not allowed to operate freely in the country.
UN chief Antonio Guterres is "deeply concerned" about the situation in Tanzania, "including reports of deaths and injuries during the demonstrations", his spokesman said in a statement.
Much public anger has been directed at Hassan's son, Abdul Halim Hafidh Ameir, accused of overseeing the crackdown.
There have been unconfirmed reports of the army siding with protesters in some places, but army chief Jacob Mkunda came out strongly on Hassan's side on Thursday, calling the protesters "criminals".
Foreign Minister Mahmoud Thabit Kombo said Friday that his government had "no figures" on any dead.
"Currently, no excessive force has been used," he said in an interview with Al Jazeera. "There's no number until now of any protesters killed."
G.Bissau army says thwarted 'subversion' attempt, several officers arrested
Bissau (AFP) Oct 31, 2025 -
Guinea-Bissau's army announced Friday it had thwarted an "attempt to subvert the constitutional order" and arrested several senior military officers on the eve of the start of general election campaigning.
"This action aimed to disrupt the electoral process," General Mamadu Ture, deputy chief of staff, told a press conference without specifying the number of officers arrested or what actions they planned to take.
Campaigning kicks off Saturday in Guinea-Bissau, approximately three weeks ahead of the legislative and presidential elections likely to be dominated by incumbent Umaro Sissoco Embalo after the main opposition was disqualified.
Embalo told reporters after a cabinet meeting Thursday that "no disorder will be tolerated", adding that the "government has taken all necessary measures to ensure the safety of each candidate during this campaign".
Brigadier General Daba Nawalna, director of a military training centre about 30 kilometres (18 miles) from the capital Bissau, is accused of being one of the masterminds of the plot and was among those arrested, Ture said.
Guinea-Bissau has laboured under a succession of coups since independence from Portugal in 1974 but since its 2014 presidential election, the Portuguese-speaking country has set itself on the path towards the rule of law.
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