A Lord of Parliament (Scots: Laird o Pairlament) was the holder of the lowest form of peerage entitled as of right to take part in sessions of the pre-Union Parliament of Scotland. Since that Union in 1707, it has been the lowest rank of the Peerage of Scotland, ranking below a viscount. A Lord of Parliament is said to hold a Lordship of Parliament.
The peerage of Scotland differs from those of England, Ireland, Great Britain and the United Kingdom, in that its lowest rank is not that of baron. In Scotland, the term "baron" refers to a feudal baron, considered to be a minor lord who is not a peer, approximately equal to a baron in some continental countries. The Scottish equivalent to the English baron is the Lord of Parliament.
A male holder of such a lordship is designated a "Lord of Parliament," while there is no similar designation for female holders. Lords of Parliament are referred to as Lord X, while female holders of Lordships of Parliament are known as Lady X, or more formally (for example) as Flora Fraser, 21st Lady Saltoun. The wife of a Lord of Parliament is also Lady X. Children of Lords of Parliament and female holders of Lordships of Parliament are styled The Honourable [Forename] [Surname], except that the heir apparent to the peerage is styled The Master of [peerage title]. Where succession by women is allowed, an heiress presumptive may be styled The Mistress of [peerage title]. After the death of father and/or mother, the child may continue to use the style "the Honourable".