Dignitaries including Rwandan President Paul Kagame, Ugandan President Yoweri Museveni and former South African president Thabo Mbeki are among the speakers at Sunday's funeral in the capital, Addis Ababa.
Washington sent a delegation led by U.N. Ambassador Susan Rice.
Meles died in Belgium last month following a lengthy illness. He ruled Ethiopia for more than 20 years, after the rebel alliance he led, the EPRDF (Ethiopian People's Revolutionary Democratic Front) seized power in 1991.
The late prime minister Meles earned praise abroad for improvements in the economy, education and health care. But human rights groups sharply criticized him for various abuses, including restrictions on independent media.
He will be buried at Trinity Church alongside other prominent Ethiopian leaders, including former emperor Haile Selassie.
Under Meles, Ethiopia fought a border war with Eritrea and sent troops to Somalia to fight Islamist militants.
Some information for this report was provided by AP and AFP.
