To be operated by the nation's air force, deliveries of the helicopters are due to begin from Leonardo's Philadelphia, Pennsylvania production facility in late 2018, running until 2020.
A further two aircraft are covered by options, the manufacturer says.
The AW119Kx helicopters will be used to perform a wide range of roles including training, medical evacuation, troop transport and short-range maritime search and rescue.
Portugal currently operates a fleet of eight Aérospatiale SA316 Alouette III light helicopters in the role.
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