More than 50 million of Ethiopia's people are registered for the elections to be held on Monday, but voting won't take place in the northern Tigray region, where the electoral board has cited "unfavourable conditions" following a 2020 to 2022 civil war and continuing political turmoil.
Abiy, 49, will be looking to further consolidate his grip on national politics. He was appointed in 2018 following mass protests against the long-ruling EPRDF coalition and his newly-formed Prosperity Party won 410 out of 484 seats in parliament in elections in 2021.
Prosperity Party candidates have campaigned on the government's economic record, citing improved food security and economic growth in Africa's second-most populous country that officials project will top 10 per cent in 2026, one of the fastest rates on the continent.
Nearly half of Ethiopia's 135 million population is under 18.
But Abiy faces insurgencies in the country's two biggest regions linked to grievances by different ethnic groups about alleged marginalisation within Ethiopia's federal system.
In his native Oromiya, a region in the south, fighting between government forces and the Oromo Liberation Army separatist group has killed hundreds of people in the past few years.
In neighbouring Amhara, a militia known as Fano has seized swathes of the countryside since 2023.
As a result, voting will not take place in at least eight of Amhara's 138 constituencies.
Though a 2022 peace deal ended the civil war in Tigray, which researchers say caused hundreds of thousands of deaths, a move this month by the main political party there to reassert control over the region's political administration has led Ethiopian officials and analysts to warn of the risk of fresh unrest.
The Prosperity Party is nevertheless expected to dominate the elections against a fragmented opposition weakened by internal rivalries. Results are expected by June 11.
Opposition parties accuse the federal government of undermining them by arresting their leaders and imposing legal obstacles to their political activities, charges denied by the government. Reuters has not been able to report from inside Ethiopia since mid-February, when the Ethiopian Media Authority declined to renew the accreditation for its three Addis Ababa-based journalists.
Upon taking office in 2018, Abiy moved to liberalise Ethiopia's tightly controlled economy and freed journalists, activists and other political prisoners. He won the Nobel Peace Prize in 2019 for ending hostilities with neighbouring Eritrea.
