Messrs. (pronounced “MESS-ers”) is the plural form of Mr., used when addressing or referring to two or more men, especially in formal writing. If you're writing a letter to Mr. Smith and Mr. Jones together, you might begin with “Dear Messrs. Smith and Jones.”

The word comes from the French messieurs, which is the plural of monsieur (Mr.). You'll most often see it in business correspondence, formal invitations, or official documents. For example, a law firm might be called “Messrs. Anderson, Brown & Company.”

While Messrs. was once common in everyday writing, it's become less popular in modern times. Many people now simply write “Mr. Smith and Mr. Jones” or use first names if they know the people well. You might still encounter it in older books, historical documents, or very formal situations.

The period after Messrs. shows it's an abbreviation. Unlike Mr. or Mrs., there's no common equivalent for a group of women, though people sometimes use Mmes. (from the French mesdames) for multiple married women in very formal contexts.