Sir David Laidlaw Knox (born 30 May 1933) is a British Conservative Party politician and former Member of Parliament.
Knox, once in Parliament, joined what was to become the Macleod Group led by Nicholas Scott that was considered to be for Conservative MPs that were pro-European and progressive on social issues and he was noted as strongly supporting Britain's entry to the EEC.
He also became President of the Macleod Group, and in that position issued a statement in January 1975 supporting Edward Heath as Conservative leader.
Knox argued that "meaningful devolution of political power for Scotland" was necessary now to avoid Scots feeling the need to vote for separatist parties.
This ran counter to Francis Pym, who was opposition spokesman for devolution at the time, whose policy was to form a constitutional body that had neither legislative or executive powers.