Peter Thomas Marshall Hill CB CVO is a British civil servant and a former political advisor.

He was appointed CEO of the 26th United Nations Climate Change Conference of the Parties (COP26) in September 2019, having previously been Principal Private Secretary to the Prime Minister.

[1] Hill worked within Peter Mandelson's and his successor Catherine Ashton's cabinet when they were the European Trade Commissioner between 2006 and 2009.

[2] Following the Conservative Party's return to government in 2010, Hill worked in the office for security and counter-terrorism when Theresa May was Home Secretary.

[4] The Prime Minister, Theresa May, appointed Peter Hill as her Principal Private Secretary in May 2017 following his predecessor Simon Case's appointment as the Director General for the UK-EU Partnership, to coordinate the process of the consequences of invoking Article 50 of the Treaty on European Union.