Richard William Alan Onslow, 5th Earl of Onslow, styled Viscount Cranley until 1911, was a British peer, diplomat, parliamentary secretary and government minister.

The Senior Deputy Speaker is an officer of the House of Lords whose main role is to preside over the House when it is in committee, either in the Lords Chamber or in Grand Committee, which is when committee stage is taken away from the floor to free up debating time in the main Chamber. The Senior Deputy Speaker deputises for the Lord Speaker, and like the Lord Speaker withdraws from political party membership. Additionally, the Senior Deputy Speaker chairs various select committees of the House, and has a role in the administration of the House.