Garry Richard Rushby Hart, Baron Hart of Chilton (29 June 1940 – 3 August 2017), was a British Labour politician. From 1998 to 2007, he was Expert and then Special Adviser to the Lord Chancellor, first Lord Irvine of Lairg and then Lord Falconer of Thoroton.

Before entering public service Hart was a highly successful planning solicitor with Herbert Smith. His appointment in 1998 was the subject of some controversy, but he was regarded as having a very beneficial influence on Lord Irvine, and serving also as a source of sound advice to Lord Falconer when the latter became Lord Chancellor in 2003. Hart helped guide the Lord Chancellor's Department as it became the Department for Constitutional Affairs, and again as it became the Ministry of Justice.

He was created a life peer on 4 June 2004 taking the title Baron Hart of Chilton, of Chilton in the County of Suffolk.

When Lord Falconer resigned in 2007, Lord Hart left his appointment. He had not spoken in the House of Lords following his peerage as this was considered inconsistent with his Government role. However, in 2007 he seconded the motion on the Queen's Speech in a well received contribution.

Lord Hart lived in Chilton Hall in Suffolk with his wife and two children. Lord Hart was also godfather to Tony Blair's daughter Kathryn.