An AFP photographer on the scene said the incident took place in the city's southern neighbourhood of Shuhada, which the Iraqi government recently retook from the Islamic State group.
"Photographer Fadil al-Garaawi was killed when a mortar round struck near a group of journalists and members of the security forces in Fallujah," a senior federal police officer said.
Three armed members of the security forces were also killed in the same incident, the officer said.
The 45-year-old photographer also contributed to Iraqi news outlets.
Iraqi forces launched a vast offensive last month to retake Fallujah, which has been out of government control since January 2014 and is one of IS's most emblematic bastions.
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