A fluid cooled laser mirror includes a body defining internal chamber means made up of inner and outer chambers generally separated by a wall defined by the body. An inlet port communicates with the inner chamber, and outlet ports communicate with the outer chamber. The wall defines a plurality of passages therethrough, allowing communication between the inner and outer chambers, so that cooling fluid may flow into the center of the body in the inner chamber, through the passages of the wall, into the outer chamber, and from the outlet ports. Vanes are appropriately placed to properly direct and guide cooling fluid so that it cools in a highly efficient manner.