John Fildes (1811 – 6 July 1875) was a British businessman and Liberal Party politician.

Fildes was a director of the Manchester, Sheffield and Lincolnshire Railway.^[1] At the 1865 general election, he was elected as the Member of Parliament (MP) for Great Grimsby,^[2] defeating the sitting Conservative MP John Chapman,^[3] who was another director of the Manchester, Sheffield and Lincolnshire Railway.^[1] Both candidates had canvassed vigorously during the campaign, with Fildes describing himself as a Liberal who had "ever supported measures conducive to the elevation and improvement of the condition of the people".^[4]

At the 1868 general election, no Conservative candidate stood in Grismby. However, Fildes was opposed by the Liberal George Tomline, who was described by The Times as a "formidable opponent".^[5] Tomline won the seat, defeating Fildes with a majority of 211 votes.^[3]