Peter Jon Kellner CBE (born 2 October 1946) is an English journalist, former BBC Newsnight reporter, political commentator, and former president of the YouGov opinion polling organisation in the United Kingdom.

His father, Michael Kellner, was an Austrian Jew, born in 1920, who emigrated to Mandatory Palestine in 1938, after Kristallnacht, and later moved to Britain.

Formerly the political analyst of the BBC Newsnight current affairs programme, Kellner was engaged by YouGov's founders, Stephan Shakespeare and Nadhim Zahawi, in December 2001.

[3] He has also been a visiting fellow at Nuffield College, Oxford, and the Institute for Policy Studies, London and has advised several large corporations.

Kellner was appointed Commander of the Order of the British Empire (CBE) in the 2023 New Year Honours for charitable services as chair of the NCVO.