A Marquess is the title for a nobleman in several European monarchies. The title is obtained only through hereditary means.

In English peerage this post is higher than that of an Earl, and lower than that of a Duke. A female with the same rank is referred to as a Marchioness.

Unlike in most Europe, in the United Kingdom, the monarchy is the only authoritative body that can bestow hereditary titles. It maintained to keep a tight hold on titles of such an aristocratic nature, in order to make sure that the positions of the peerage still match up with the wealth of those who do have titles. Hence, so far there are only thirty-four marquessates.

The very first marquess in Britain went by the name of Robert de Vere, 9th Earl of oxford, who was made Marquess of Dublin by Richard II on the 1st of December in the year 1385.