The 225-seat parliament will vote to choose new leader, who will have to address country's economic and political collapse amid protests, with Ranil Wickremesinghe seen as frontrunner.
Three candidates have been nominated to replace former Sri Lankan president Gotabaya Rajapaksa, who fled the country and resigned last week over the island's worsening economic crisis.
In his resignation letter to parliament, Gotabaya Rajapaksa says he did his "utmost" to avoid an economic catastrophe in Sri Lanka, but the coronavirus pandemic derailed his efforts.
Subscribe to our Youtube channel for all latest in-depth, on the ground reporting from around the world.
Copyright © 2023 TRT World.