Allegations of corruption involving the 76-year-old's relatives and aides during his 2008-2013 presidential term have mounted in recent weeks as prosecutors investigate multiple cases of bribery amounting to millions of dollars.
The investigation into Lee means all four living former South Korean presidents have been convicted, charged, or embroiled in criminal inquiries.
"I stand here with a heavy heart," Lee said as he arrived at the prosecutors' office in Seoul, after a car journey from his home in the south of the capital covered live on television.
Lee, accompanied by his defence lawyer, was received by a senior prosecutor and given tea before being ushered into room 1001, the same place his successor and ousted former president Park Geun-hye underwent marathon questioning.
He was to be interrogated by three prosecutors and Yonhap news agency said the questioning -- which will be videotaped -- was expected to last around 20 hours, with prosecutors having prepared around 120 pages of questions relating to some 20 alleged offences.
Lee is expected to return home after the questioning, but prosecutors are thought likely to then ask a court for an arrest warrant.
Two of Lee's former aides have been arrested as part of the investigation and the homes and offices of his brothers raided.
He has previously denounced the inquiry as "political revenge" and said today he hoped it would be the "last time in history" that a former South Korean head of state was summoned for questioning by prosecutors.
South Korean presidents have a tendency to end up in prison -- or meet untimely ends -- after their time in power, usually once their political rivals have moved into the presidential Blue House.
Park was ousted last year over a massive corruption scandal that emerged in 2016, and the verdict in her bribery and abuse of power trial is due next month, with prosecutors demanding 30 years in jail.
Lee's own predecessor, the liberal Roh Moo-hyun, committed suicide by jumping off a cliff after being questioned over corruption allegations in 2009.
Their sentences were later commuted to life in prison, and they were eventually pardoned and released after serving about two years each.
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