Anote Tong won a third successive term in January 2012, having gained nearly 42% of the vote.
It is his final term in office, as the constitution restricts the president to a maximum of three four-year terms.
Mr Tong says he will continue to push for global recognition of the effects of climate change and rising sea levels on Kiribati. Economic development is another priority.
The president is also head of the government. Parliament has 42 members, one of whom represents evacuees from Banaba who now live on Rabi, in Fiji.
In 2012, Mr Tong began negotiations with the Fijian government to buy land on Fiji that could be used for the relocation of Kiribati citizens in the event of sea levels rising still further.