Baron Killearn, of Killearn in the County of Stirling,^[1] is a title in the Peerage of the United Kingdom. It was created in 1943 for the diplomat Sir Miles Lampson. He was the second son of Norman Lampson, youngest son of Sir Curtis Lampson, 1st Baronet, of Rowfant (see below). Lord Killearn's eldest son, the second Baron, succeeded his second cousin once removed as fourth Baronet in 1971. On his death the titles passed to his half-brother, the third and (As of 2017^[update]) present holder of the barony and baronetcy.

The Lampson Baronetcy, of Rowfant in the County of Sussex,^[2] was created in the Baronetage of the United Kingdom in 1866 for the Anglo-American businessman Curtis Lampson. His grandson, the third Baronet, was an author, journalist and explorer, notably in Central and West Africa. On his death in 1971 the title was inherited by his second cousin once removed, the aforementioned third Baron Killearn (see above).

The family seat is Little Sodbury Manor, near Chipping Sodbury, South Gloucestershire.