What the “M” Line on a Wedding RSVP Card Really Means

A wedding invitation can feel surprisingly formal, especially when the reply card includes traditions many guests have never encountered. One of the most confusing is a blank line beginning with a single capital “M.” It is not a request for your middle initial, meal choice, or an abbreviation for “maybe.”

The letter is simply the beginning of a traditional courtesy title. Guests complete the line with “Mr.,” “Mrs.,” “Miss,” or another appropriate title, followed by their name. For example, a married couple might write “Mr. and Mrs. Jordan Lee,” while an individual guest might write “Ms. Taylor Reed.”

How to fill it out correctly

Use the name or names shown on the invitation, then indicate whether you will attend. If the card asks for the number of guests, write that number clearly. When meal selections are offered, add each guest’s initials beside the chosen dish so the hosts can match meals to people.

Modern etiquette is flexible. If “M” does not suit your title, simply write your preferred title and name in the available space. The hosts mainly need an accurate response, correct spelling, and a reliable head count.

Return the card before the stated deadline. That small courtesy helps the couple finalize seating, catering, and other details—and now the mysterious “M” need not cause another moment of hesitation.