Prince Harry and Meghan Markle will join hundreds of Australians and New Zealanders in London to commemorate Anzac Day.

The couple will attend a dawn service to remember the soldiers from the two countries who paid the ultimate sacrifice in World War I and subsequent conflicts.

Later in the day, the prince and his fiancee will join a Westminster Abbey congregation for a service of commemoration and thanksgiving.

The Dawn Service will be staged at Wellington Arch in central London and will begin at the New Zealand memorial where Harry will lay a wreath.

The prince, Ms Markle and Sir Jerry Mateparae and Alexander Downer, the high commissioners of New Zealand and Australian respectively, will then walk to the nearby Australian memorial.