Marcus John Hudson Fysh[2] (born 8 November 1970) is a British politician and former investment manager who was the Member of Parliament (MP) for Yeovil from 2015[3] until he lost the seat in 2024.

[6] After graduation, he ran companies in the agriculture and healthcare sectors, as well as working for Mercury Asset Management specialising in investment in businesses in the Asia Pacific region.

[15] He has been a member of All-party parliamentary groups for the Armed Forces, for Housing, for Education, for Social Care, for County Councils, and for Women Against State Pension Inequality.

[17][18] In March 2019, Fysh was one of 21 MPs who voted against LGBT inclusive sex and relationship education in English schools, citing concerns about the teaching of gender fluidity confusing very young children.

He exercised his right as a Member of the House to express disagreement with the Commissioner's interpretation of the rules and bring the matter before the Committee.

[29] In September 2023, Fysh was ordered to apologise to Parliament after being found to have broken the MPs' code of conduct; this related to statements he gave concerning an investigation by the Parliamentary Commissioner for Standards into the All Party Parliamentary Group for Education (which Fysh chaired) whilst the investigation was ongoing.