The kind gesture is being offered by Toby Carvery as a way to thank the national heroes for their service.
They wrote on their website: "Here at The Home of the Roast, we want to thank the people of our Armed Forces in the best way we know and that's with a feast that's fit for heroes.
"We will be serving delicious free breakfast, carvery or main meal to all serving and veteran military personnel - including troops, veterans and reserves - on Saturday 26th June 2021".
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Those who are eligible can download the voucher from the Toby App then show it alongside the Military ID card upon order.
Armed Forces Day takes place on the last Saturday each June. In 2021, it will take place on Saturday 26 June.