Humayun Saqib Muazzam Khan was a United States Army officer who was killed by a suicide attack near Baqubah, Iraq during the Iraq War. He came to national attention in the United States during the 2016 presidential campaign as an example of a Muslim American soldier who died in service to the U.S. military.

Baqubah is the capital of Iraq's Diyala Governorate. The city is located some 50 km (31 mi) to the northeast of Baghdad, on the Diyala River. In 2003 it had an estimated population of some 280,000 people.