Gustav Adolph Roch (German: [???]; 9 December 1839 – 21 November 1866) was a German mathematician who made significant contributions to the theory of Riemann surfaces.
But in a sad reminiscence of the tragedies of Évariste Galois, Niels Henrik Abel and Gotthold Eisenstein, his promising career was cut short by untimely death at the age of 26.