The Duke of Edinburgh, Prince Philip, will retire from royal duties in August.
Prince Philip is the Queen’s husband.
He would attend previously scheduled engagements between now and August but would not accept new invitations.
The prince – who turns 96 next month – carried out 110 days of engagements last year.
He was the patron, the president or a member of more than 780 organisations and would continue to be associated with them, but “will no longer play an active role by attending engagements”, Buckingham Palace said.
The palace said the 91-year-old queen would continue to carry out her full programme of engagements.
The pair celebrate their 70th wedding anniversary in November.