Scotty's Little Soldiers will be joining the Royal wedding celebrations at the Queen's Norfolk retreat.
Members of the King's Lynn based charity for bereaved forces families will join crowds of people on the lawn at Sandringham Visitor Centre on Saturday to watch the live broadcast of the wedding on an outdoor big screen.
Scotty's is one of seven charities specially selected by Prince Harry and Meghan Markle to benefit from donations made to the couple on their wedding day.
Charity founder Nikki Scott said: 'The last few weeks have been absolutely fantastic, the awareness and donations we've received have been incredible and we're so grateful to Prince Harry and Meghan for choosing us.
'Celebrating the wedding at Sandringham just seemed like the perfect fit, it's local to Scotty's and has that royal connection.
'We're extremely grateful for all of their support, which will go a long way in helping us keep the smiles on the faces of bereaved Forces children, who at such a young age have already been through so much.'
Army wife Nikki Scott set up Scotty's Little Soldiers in her husband's name, Corporal Lee Scott, after he was killed in Afghanistan in 2009, leaving behind their two small children.
The charity supports more than 300 children across the UK who have lost a parent in the British Armed Forces.
Other charities chosen are Children's HIV Association (CHIVA), homeless charity Crisis, the Myna Mahila Foundation, StreetGames, Surfers Against Sewage and the Wilderness Foundation UK.
Kensington Palace said: 'Prince Harry and Ms Meghan Markle are incredibly grateful for the goodwill shown to them since the announcement of their engagement and are keen that as many people as possible benefit from this generosity of spirit. The couple have therefore asked that anyone who might wish to mark the occasion considers making a donation to charity, rather than sending a wedding gift.
'The couple have chosen charities which represent a range of issues that they are passionate about, including sport for social change, women's empowerment, conservation, the environment, homelessness, HIV and the Armed Forces. Many of these are small charities, and the couple are pleased to be able to amplify and shine a light on their work.'
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