Cachia V., Zagrebnov V.A. Operator-Norm Convergence of the Trotter Product Formula for Sectorial Generators (23K, LATeX 2e) ABSTRACT. The operator-norm convergence of the Trotter product formula is known for self-adjoint semigroups with compactness or smallness conditions on the generators involved in this formula. We generalize these two types of results to sectorial generators.