A novel maize variety designated PHR0C and seed, plants and plant parts thereof. Methods for producing a maize plant that comprise crossing maize variety PHR0C with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PHR0C through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby. Hybrid maize seed, plant or plant part produced by crossing the variety PHR0C or a trait conversion of PHR0C with another maize variety. Inbred maize varieties derived from maize variety PHR0C, methods for producing other inbred maize varieties derived from maize variety PHR0C and the inbred maize varieties and their parts derived by the use of those methods.