Baron Grimston of Westbury, of Westbury in the County of Wiltshire, is a title in the Peerage of the United Kingdom.

[1] It was created in 1964 for the Conservative politician and former Deputy Speaker of the House of Commons, Sir Robert Grimston, 1st Baronet.

[2] Grimston was the son of Reverend Canon the Hon.

As of 2017[update] the titles are held by his grandson, the third Baron, who succeeded his father in 2003.

The heir presumptive is the present holder's brother the Hon.