A rice cultivar designated CL172 is disclosed. The invention relates to the seeds of rice cultivar CL172, to the plants of rice CL172, to methods for producing a rice plant produced by crossing the cultivar CL172 with itself or another rice variety, and to methods for controlling weeds in the vicinity of plants of rice cultivar CL172, which comprises increased resistance to acetohydroxyacid synthase-inhibiting herbicides. The invention further relates to hybrid rice seeds and plants produced by crossing the cultivar CL172 with another rice cultivar.
