The bride and the groom are reported to be among the victims, according to local media.
The fire happened in the district of Al-Hamdaniya in Iraq's northern Nineveh province late on Tuesday evening.
It is not yet clear what caused the blaze, but early reports say it broke out after fireworks were lit.
A photo posted by Iraqi news agency Nina showed firefighters battling the blaze, and pictures from local journalists on social media show the charred-out remains of the event hall.
