A soldier from 3rd Battalion The Rifles was killed by "enemy action" while on patrol in the Nad-e-Ali district.
It later emerged a soldier from 30 Armoured Engineer Squadron, 26 Engineer Regiment, had also been killed. Both families have been informed.
Their deaths take the number of British service personnel killed in Afghanistan since operations began in 2001 to 424.
The second casualty died of injuries sustained by "enemy action" while he was involved in a construction task in Nad-e-Ali district.
Task Force Helmand spokesman Maj Ian Lawrence said offered his "deepest sympathy" to the families of both soldiers.
Their identities are expected to be announced on Saturday.
Earlier, the International Security Assistance Force (Isaf) said three US soldiers were killed in an incident in south-west Afghanistan by "an individual wearing Afghan uniform".
Tags: US, UK, Occupation, of, Afghanistan, Helmand, Taliban, ANA, Pakistan, terrorist, Punjabi, ISI, Al, Qaeda
Location: Afghanistan (load item map)
Marked as: approved
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