William Grant is a Scottish Conservative Party politician who was the Member of Parliament (MP) for the Ayr, Carrick and Cumnock UK Parliamentary constituency from June 2017 to November 2019.

Ayr, Carrick and Cumnock is a county constituency represented in the House of Commons of the Parliament of the United Kingdom. It was created for the 2005 general election from parts of the old Ayr and Carrick, Cumnock and Doon Valley constituencies. It has been represented since 2019 by Allan Dorans of the Scottish National Party.