While the immediate cause of death was unclear. The Italian daily Corriere della Sera reported that he was hospitalised last year for a respiratory ailment.
Andreotti was a leading member of Italy's now defunct Christian Democracy party, which dominated post World War II Italy for decades.
He was a lawmaker in every Italian parliament since 1946 and was made a senator-for-life in 1991.
However, he was accused of being involved in a murder and having mafia ties in the late 1990s, but was later acquitted of both charges.