The order for more than 100 of the MK 1 MOD 1 robots is worth $21 million.
The company said it is the fourth order from the Naval Sea Systems Command it has received under a $230 million indefinite-delivery/indefinite-quantity quantity award previously given it.
Orders under the overall contract stand at $36 million, it said.
"Improvised explosive devices remain one of the biggest threats to our forces overseas," said Robert Moses, president of iRobot's Government and Industrial Robots division. "IRobot's unmanned ground vehicles save lives every day by providing our troops with the ability to identify and dispose of IEDs from a safe standoff distance."
The MTRS MK 1 MOD 1 is modeled after the iRobot 510 PackBot. These combat-proven robots perform bomb disposal and other dangerous missions.
iRobot has delivered more than 4,000 unmanned ground vehicles to military and civil defense forces worldwide.