He described the honour as the "proudest moment" of his career, reflecting on his journey from East London to being recognised by King Charles.
Beckham revealed that King Charles inspired the grey suit he wore to the ceremony, which was designed by his wife, Lady Victoria Beckham.
The football icon highlighted his long-standing philanthropic work, including his role as a UNICEF goodwill ambassador since 2005, noting the impact his platform has on charitable causes.
Other notable figures honoured at the same ceremony included Nobel Prize-winning novelist Sir Kazuo Ishiguro and West End performer Dame Elaine Paige.