Masum arrived in Saudi Arabia yesterday and met with King Abdullah, the highest-level contact between the neighbouring countries in years.
No programme was announced for his talks today.
The main focus of the visit is "normalising diplomatic and political relations between the two countries," Finance Minister Hoshyar Zebari, who is part of the Iraqi delegation, told AFP.
The two sides also discussed "cooperation in the field of fighting terrorism and economic, trade and security relations," Zebari said.
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Earlier this year, Riyadh blamed Maliki's Shiite-led government's "sectarian policies" for the rise of the Islamic State jihadist group, which has overrun large parts of the country since June.
Baghdad shot back that Riyadh was "siding with terrorism" and responsible for providing militants with "financial and moral support."
But Iraq is now reaching out to countries in the region and beyond for help in driving IS back.