Aid agencies say that tens of thousands of people "lack access to water, food, electricity and basic health services" in areas recaptured by the army in Mosul and surrounding towns and villages.
More than 54,000 people have been displaced so far in the campaign and 700,000 people are thought to need shelter, food, water or medical support.
Hundreds of civilians who fled fighting near Mosul last week are stranded without basic humanitarian assistance, underlining the challenges of the largest military operation in Iraq in over a decade.
Families have been living for up to six days in abandoned homes and a school building in the village of Baybukh, about 6 km (4 miles) from the frontline at Mosul's northern border.
More than 54,000 people have been displaced so far in the campaign and 700,000 people are thought to need shelter, food, water or medical support.
The Norwegian Refugee Council said that tens of thousands of people "lack access to water, food, electricity and basic health services" in areas recaptured by the army in Mosul and surrounding towns and villages.
No humanitarian assistance has reached Baybukh in the past week and the people there have been barred from moving to a government-run camp or a village further from the combat zone.
"There is no food - no breakfast, no lunch, no dinner," said one man. "People are sleeping on top of each other. Women and children inside and men out in the open."
The situation has become so desperate that army officers say they have begun distributing rations meant for their soldiers and buying extra supplies out of their own pockets.
But even that is not enough.
Major Emad al-Ani said if he manages to provide food for 10 people, another 10 are lined up right behind them.
"This is a tragedy and it could become a humanitarian disaster," he said.
As women looked on from the school building's balconies, men of all ages crowded around a Reuters team visiting the site on Sunday. The men talked over each other in desperate attempts to bring attention to their plight as the sound of mortars rung out from the nearby battlefield.
"We just want to get out of here," said one man. "We have been sleeping in the dirt for five days."
"We want the most basic rights. Just take us to a camp," said another.
PHOTO CAPTION
Iraqis fleeing the violence in the northern city of Mosul arrive at the Kurdish checkpoint of Makhmur. (AFP)
Reuters