High-level Pakistani officials received Zarif and gave him a warm welcome.
The Foreign Office said that the Iranian FM, during his two-day visit, will meet his Pakistani counterpart Shah Mehmood Qureshi in a one-on-one meeting.
Iranian FM Zarif will hold official talks with FM Qureshi, the FO said in a statement.
The Iranian minister is also expected to meet Prime Minister Imran Khan and Chief of Army Staff General Qamar Javed Bajwa.
On Wednesday, US Defence Secretary James Mattis confirmed Secretary of State Mike Pompeo and Chairman of the Joint Chiefs of Staff Committee General Joseph Dunford will visit Pakistan next week to meet PM Imran.