Giovanni Felder (18 November 1958 in Aarau) is a Swiss mathematical physicist and mathematician, working at ETH Zurich.

He specializes in algebraic and geometric properties of integrable models of statistical mechanics and quantum field theory.

[2] His doctoral dissertation, entitled Renormalization Group, Tree Expansion, and Non-renormalizable Quantum Field Theories, was supervised by Jürg Fröhlich (and Konrad Osterwalder).

In the late 1980s Felder did research with Krzysztof Gawedzki and Antti Kupiainen on the geometry of the Wess-Zumino-Witten model in conformal field theory.

[8][9] In 1989 he introduced a BRST approach to the "minimal two-dimensional conformal invariant models of Belavin, Polyakov and Zamolodchikov.