Sir Graham Robert Watson is a British Liberal Democrat politician who served as a Member of the European Parliament (MEP) for South West England from 1994 to 2014. Watson was the chairman of the Parliament's committee on citizens rights, justice and home affairs (1999–2002). He then served for seven and a half years as leader of the Liberal Group in the European Parliament, first as leader of the European Liberal Democrat and Reform Party Group (2002–2004) and then as leader of the new Alliance of Liberals and Democrats for Europe Group (2004–2009). From 2011 until 2015, he was the president of the Alliance of Liberals and Democrats for Europe Party. From 2015 to 2020, he was a UK Member on the European Economic and Social Committee. He is currently an adjunct Professor at the University of Toronto's Munk School of Global Affairs and Public Policy.

The Group of the Alliance of Liberals and Democrats for Europe was the liberal–centrist political group of the European Parliament from 2004 until 2019. It was made up of MEPs from two European political parties, the Alliance of Liberals and Democrats for Europe Party and the European Democratic Party, which collectively form the Alliance of Liberals and Democrats for Europe.