James Gerald Hylton Schneider (born 17 June 1987) is a progressive English political organiser and writer. He co-founded the left-wing grassroots movement Momentum and served as public relations advisor to Jeremy Corbyn. In 2022, Schneider published Our Bloc: How We Win, laying out a strategy for the British left in the 2020s, both within Labour and beyond. He is also an international chess player.