A novel hybrid maize variety designated X0923B and seed, plants and plant parts thereof, produced by crossing two Pioneer Hi-Bred International, Inc. proprietary inbred maize lines. Methods for producing a maize plant that comprises crossing hybrid maize variety X0923B with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into X0923B through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby. This invention relates to the hybrid seed X0923B, the hybrid plant produced from the seed, and variants, mutants, and trivial modifications of hybrid X0923B. This invention further relates to methods for producing maize lines derived from hybrid maize variety X0923B and to the maize lines derived by the use of those methods.