How to Address a Letter to a Peer: A Guide to British Forms of Address

Few things make a careful correspondent hesitate quite like a title. You may be writing to thank a hostess at a country house, invite a patron to a charity evening or reply to a letter from a retired judge, and suddenly the simple question of what to put on the envelope feels like a test.

The good news is that British forms of address follow a clear logic. Once you understand the pattern, you can write with confidence, and the recipient will notice the courtesy of a letter addressed correctly.

Why the envelope and the greeting differ

The most useful rule to remember is that the envelope is formal, while the salutation inside is usually more personal. The envelope carries the full style of the title. The letter itself often opens with a shorter form that you would also use when speaking to the person.

This is why a letter to an earl might be addressed to The Earl of Somewhere on the outside and open with Dear Lord Somewhere on the inside. Keeping the two separate in your mind solves most of the confusion.

Writing to the peerage

The British peerage has five ranks: duke, marquess, earl, viscount and baron. Each has its own envelope style, but the letters inside follow a simple pattern.

Dukes and duchesses

A duke is the exception to the general rule. The envelope reads The Duke of Somewhere, and a social letter opens Dear Duke. His wife is addressed as The Duchess of Somewhere and greeted as Dear Duchess. In conversation, Duke or Duchess is perfectly correct, with Your Grace reserved for more formal occasions.

Marquesses, earls, viscounts and barons

For the other four ranks, the envelope gives the full title: The Marquess of Somewhere, The Earl of Somewhere, The Viscount Somewhere or, for a baron, The Lord Somewhere. Inside, each is simply Dear Lord Somewhere.

Their wives follow suit. The envelope reads The Marchioness, The Countess, The Viscountess or The Lady, while the letter opens Dear Lady Somewhere. Life peers, who sit in the House of Lords but do not pass on their titles, are addressed in the same way as hereditary barons. A woman who holds a life peerage in her own right is styled The Baroness on the envelope, and may be greeted as Lady Somewhere or, as is increasingly common, Baroness Somewhere.

The courtesy titles of their families

The children of peers are where most mistakes are made, so it is worth taking a moment here. The eldest son of a duke, marquess or earl often uses one of his father's lesser titles as a courtesy, and is addressed accordingly.

Younger sons of dukes and marquesses are Lord John Smith, greeted as Dear Lord John. Daughters of dukes, marquesses and earls are Lady Mary Smith, greeted as Dear Lady Mary. The younger sons of earls, and the children of viscounts and barons, carry the style The Hon. on the envelope only. Inside the letter, and in conversation, they are simply Mr Smith or Miss Smith.

Knights, dames and baronets

Knighthoods and damehoods are honours given to the person rather than titles of rank, and the forms reflect that. A knight is Sir followed by his first name and surname on the envelope, with any post nominal letters after it. The letter opens Dear Sir John, never Dear Sir Smith.

His wife is Lady Smith, using the surname only. A dame is addressed as Dame Mary Smith on the envelope, with her post nominals, and greeted as Dear Dame Mary. A baronet is styled like a knight, with Bt added after his name on the envelope.

A word on writing to the Royal Family

Most letters to members of the Royal Family are handled by their private offices, and you may address your letter to the relevant private secretary if you prefer. The Royal Household has said there is no obligatory style for writing to the Royal Family, though a traditional letter opens with Sir or Madam.

In speech, the convention is Your Majesty or Your Royal Highness at first, and then Sir or Ma'am, pronounced to rhyme with jam, thereafter.

Signing off with grace

For most social letters to titled people, Yours sincerely is entirely appropriate, just as it would be for anyone you know by name. Yours faithfully belongs to letters that begin Dear Sir or Dear Madam. Avoid overly elaborate closings unless you are certain the occasion calls for them.

When in doubt, a quick look at a reputable reference such as Debrett's will settle the question. And if you do make a small slip, remember that a warm, thoughtful letter is always received more kindly than a perfect but cold one. Courtesy, after all, is the point of the exercise.