Baron Catto, of Cairncatto in the County of Aberdeen, is a title in the peerage of the United Kingdom. The only hereditary peerage newly conferred during the reign of King Edward VIII, the barony was created on 24 February 1936 for the businessman, banker and public servant, Sir Thomas Catto, 1st Baronet. He had already been created a baronet, of Peterhead, on 5 July 1921. the titles are held by his grandson, the third baron, who succeeded his father in 2001.

Catto baronets (1921)

Baron Catto (1936)

The heir presumptive is the present holder's brother, the Hon. Alexander Gordon Catto (b. 1952). The heir presumptive's heir apparent is his son, Thomas Innes Gordon Catto (b. 1983).

Line of succession

Arms