Dishwasher drain assemblies having overmolded volutes are disclosed. A disclosed example drain assembly for a dishwasher having a tub, a sump fluidly coupled to the tub, and a discharge outlet includes a drain pump having an impeller to pump fluid from the sump to the discharge outlet, and a resilient member overmolded onto at least a portion of the drain pump, the resilient member defining a volute for the drain pump.