Frank Ernest Field, Baron Field of Birkenhead, is a British politician who was the Member of Parliament (MP) for Birkenhead for 40 years, from 1979 to 2019, serving as a Labour MP until August 2018 and thereafter as an Independent. In 2019, he formed the Birkenhead Social Justice Party and stood unsuccessfully as its sole candidate in the 2019 election. After leaving the House of Commons he was awarded a life peerage in 2020 and sits in the House of Lords as a crossbencher.