The positions are in its claims department and represent around one third of its local workforce.
A statement said: "Today we have briefed employees in our Belfast office on changes to our claims function.
"We will be closing our claims function in Belfast by the end of April 2015."
Aviva said the work will move to locations in England.
"These changes have not been taken lightly, and we will work closely with those affected to provide as much support as possible," they added.
"Other Aviva teams based in Belfast are not impacted."

The new contract for the 25-year-old represented "a landmark day" for Marlins owner Jeffrey Loria.
The value of the deal makes it a record, although the £187m ($292m) 10-year contract signed by Detroit's Miguel Cabrera is worth more annually.
Stanton has hit a total of 154 home runs in five Major League seasons.
The American outfielder missed the final 17 games of last season after being struck in the face by a pitch but still hit 37 home runs in 2014, the most in the National League.
"I'm happy for the city, I'm happy for him and I'm thrilled for baseball," added Loria, who said the deal includes a no-trade clause and allows Stanton to opt out after six years.
"Besides being a terrific athlete, he's a first-class young man. I've loved watching him play, but I love this kid. He's just a special young man."
The insurance group Aviva is to axe around 30 jobs at its office in Belfast, a company spokesman has told the BBC.
[NEXT_CONCEPT]
Giancarlo Stanton has agreed the most expensive ever deal in United States sport by signing a £208m ($325m) 13-year contract with Miami Marlins.