"A request for pardon arrived at the president's office today," it said in a brief statement.
"As is the custom with every request for a pardon it has been passed for handling to the presidential legal department," the statement added.
Katsav, the first Israeli head of state to be sent to prison, was jailed in 2011 for seven years on two counts of rape as well as sexual harassment, indecent acts and obstruction of justice.
"The prisoner has presented himself as a victim and has continually attributed responsibility for his situation to others," the justice ministry said in a statement following the decision.
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Katsav's 18-month trial included harrowing accusations and portrayed him as a sexual predator who routinely harassed his female staff. The offences committed against his employees were said to have occurred when he served as tourism minister and later as president.
Katsav became president in 2000, resigning over the allegations in 2007.