The Foreign Office said Wednesday that William Hague will meet officials including Prime Minister Nouri al-Maliki and Foreign Minister Hoshyar Zebari.
Hague said the politicians would discuss "U.K. support for the political process in Iraq" as well as the violence in neighboring Syria.
Iraq is enduring one of its bloodiest periods since the U.S. troop pullout last year.
Hague condemned as "appalling terrorist attacks" a series of bombings that killed more than 100 people earlier this week.
Britain was a key U.S. ally in the 2003 invasion, sending 40,000 troops to Iraq. It pulled out the last of its combat forces in 2009.