They will be joined at the National Memorial Arboretum, Staffordshire, by nearly 300 family members and friends who lost loved ones in terrorist attacks abroad.
The Archbishop of Canterbury, Justin Welby, will lead the ceremony to dedicate the memorial, entitled Still Water, which was designed by Alison Wilding and Adam Kershaw.
The Secretary of State for Foreign and Commonwealth Affairs, Boris Johnson, Home Secretary Sajid Javid and Tobias Ellwood, Minister for Defence People and Veterans, who has led on the delivery of the Memorial and whose brother was killed in the 2002 Bali bombing will also attend.
Tobias Ellwood, Minister for Defence People and Veterans said:
Today is a day when we remember the lives of those who were tragically taken in terrorist attacks abroad.
I know from personal experience that in times of pain we must come together to support and help one another. This memorial stands as a symbol of our unity against violence and hatred and will be a peaceful space for families to remember their loved ones.
It is hoped that the memorial will become a place of reflection, remembrance and contemplation for anyone who has been affected by terrorism.