Iran Press/ Asia: Erdogan won 52.2 percent of the vote while his rival Kemal Kilicdaroglu 47.8 percent in the May 28 run-off vote.
Türkiye's longest-serving president faces considerable diplomatic challenges amid tensions with the West.
Saturday’s inauguration in parliament will be followed by a lavish ceremony at the presidential palace in the capital Ankara attended by dozens of world leaders.
The 69-year-old leader will later in the day name his cabinet, which will be tasked with handling an economic crisis that has witnessed runaway inflation and the collapse of the lira.
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Erdogan introduces new Turkish cabinet on Saturday