She was nominated by three Norwegian MPs.
Norwegian deputy Andre Ovstegard told the "VG" newspaper on Wednesday that he and two other parliamentarians of the Socialist Left Party have nominated Thunberg because "climate threats are perhaps one of the most important contributions to war and conflict", and "the mass movement that she has promoted is a very important contribution to peace", reports Efe news.
What are the school protests?
Omar is also supporting her daughter's movement by promising to attend the nationwide protest in Washington, DC, on Friday.
Hundreds of thousands of children in some 100 countries are expected to walk out of school on Friday in solidarity.
So far, there have been regular walkouts around the world, including in countries likes Germany, Belgium, the UK, France, Australia and Japan.
"Youth Strike 4 Climate Derry'" is being led by Foyle College student, 17-year-old Jodi Desmond, who has been inspired by the actions of 16-year-old Swedish activist, Greta Thunberg, who has called on students all over the world to strike on Fridays in protest against climate change.
Since then, she has been missing lessons most Fridays to stage her regular protests.
National politicians, global officials, academics and previous winners are among those who can nominate potential recipients.
There are 301 candidates for the Nobel Peace Prize for 2019, out of which 223 are individuals and 78 are organisations, says the Nobel committee on its website.
Thousands of people, including lawmakers and cabinet members from around the world, former laureates and some university professors, are entitled to nominate people for the prize.
The names of nominators and nominees are not normally made public until 50 years have elapsed, it adds.