Baron Grenfell, of Kilvey in the County of Glamorgan, is a title in the Peerage of the United Kingdom.

It was created on 15 July 1902 for the military commander Sir Francis Grenfell.

[2] His eldest son, the second Baron, was Deputy Speaker of the House of Lords and Chairman of Committees from 1963 to 1976.

As of 2010[update] the title is held by the latter's son, the third Baron, who succeeded in 1976.

The heir presumptive to the barony is the present holder's first cousin once removed, Richard Arthur St Leger Grenfell (born 1966).