Katharine Jane Hudson (born 1958[1]) is a British left-wing political activist and academic who is a vice-president of the Campaign for Nuclear Disarmament (CND) and co-national secretary of Left Unity.

She was head of social and policy studies at London South Bank University from September 2003 to 2010 and subsequently a visiting research fellow.

Hudson was selected as the Respect candidate for the 2012 Manchester Central by-election but subsequently stood down in protest at "unacceptable and un-retracted statements about the nature of rape" made by the party's only MP, George Galloway.

[6] The campaign founded the Left Unity party in November 2013, and Hudson was elected National Secretary of the organisation at its first policy conference on 29 March 2014.

[7] In the 1990s, Kate Hudson met and married Redmond O'Neill (1954–2009), an activist in Socialist Action and adviser to Ken Livingstone.